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Zoom-In
Title Zoom-In
Description This "zoom" starts in the Scorpius constellation and pushes through deeper and narrower telescopic fields to at last reach Kepler's Supernova Remnant, a composite of images from NASA s Chandra X-Ray Observatory, Hubble Space Telescope, and Spitzer Space Telescope.
Enceladus Atmosphere Not Glo …
Description Enceladus Atmosphere Not Global
Full Description On July 11, 2005, the Cassini ultraviolet imaging spectrograph observed the star Bellatrix as it passed behind Enceladus, as seen from the spacecraft. The starlight was observed to dim when it got close to Enceladus, indicating the presence of an atmosphere, as illustrated in figure A. The ultraviolet imaging spectrograph team was able to identify water vapor as the composition of the atmosphere from absorption features in the spectrum of the star. From the depth of the absorption features, it was also possible to estimate the quantity of water vapor the starlight passed through. The colors show the undimmed star signal (blue) versus the dimmed star signal (pinkish). Enceladus' atmosphere is localized, not global in extent. As Bellatrix re-emerged from behind Enceladus, there was no dimming of the starlight observed. An occultation of the star Lambda Scorpius in February also showed no sign of an atmosphere, as illustrated in figure B. In figure A and B, the arrow marks the path of the star as it was blocked from view by Enceladus. In figure A, the dimming of the starlight shows as a gradual decrease in brightness, while in figure B the starlight drops abruptly just at the point in time that the star goes behind Enceladus. The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The ultraviolet imaging spectrograph was built at, and the team is based at the University of Colorado, Boulder. The imaging operations center is based at the Space Science Institute in Boulder, Colo. For more information about the Cassini-Huygens mission visit http://saturn.jpl.nasa.gov. The ultraviolet imaging spectrograph team home page is at http://lasp.colorado.edu/cassini. The Cassini imaging team homepage is at http://ciclops.org . Credit: NASA/JPL/Space Science Institute
Date August 30, 2005
Hubble Images a Swarm of Anc …
Title Hubble Images a Swarm of Ancient Stars
General Information What is Hubble Heritage? A monthly showcase of new and archival Hubble images. Go to the Heritage site. This stellar swarm is M80 (NGC 6093), one of the densest of the 147 known globular star clusters in the Milky Way Galaxy. Located about 28,000 light-years from Earth, M80 contains hundreds of thousands of stars, all held together by their mutual gravitational attraction. Globular clusters are particularly useful for studying stellar evolution, since all of the stars in the cluster have the same age (about 15 billion years), but cover a range of stellar masses. Every star visible in this image is either more highly evolved than, or in a few rare cases more massive than, our own Sun. Especially obvious are the bright red giants, which are stars similar to the Sun in mass that are nearing the ends of their lives.
Hubble Uncovers Oldest "Cloc …
Title Hubble Uncovers Oldest "Clocks" in Space to Read Age of Universe
General Information What is a Space Science Update? Major Hubble discoveries on NASA television ... Astronomers explain their Hubble discoveries at a press conference, called a Space Science Update (SSU), broadcast on NASA television. The SSU includes a question and answer session with members of the media. Back to top [ #top ]
Hubble Uncovers Oldest "Cloc …
Title Hubble Uncovers Oldest "Clocks" in Space to Read Age of Universe
General Information What is a Space Science Update? Major Hubble discoveries on NASA television ... Astronomers explain their Hubble discoveries at a press conference, called a Space Science Update (SSU), broadcast on NASA television. The SSU includes a question and answer session with members of the media. Back to top [ #top ]
Hubble Uncovers Oldest "Cloc …
Title Hubble Uncovers Oldest "Clocks" in Space to Read Age of Universe
General Information What is a Space Science Update? Major Hubble discoveries on NASA television ... Astronomers explain their Hubble discoveries at a press conference, called a Space Science Update (SSU), broadcast on NASA television. The SSU includes a question and answer session with members of the media. Back to top [ #top ]
Hands-On Book of Hubble Imag …
Title Hands-On Book of Hubble Images Allows the Visually Impaired to "Touch the Universe
Hands-On Book of Hubble Imag …
Title Hands-On Book of Hubble Images Allows the Visually Impaired to "Touch the Universe
Hands-On Book of Hubble Imag …
Title Hands-On Book of Hubble Images Allows the Visually Impaired to "Touch the Universe
Hands-On Book of Hubble Imag …
Title Hands-On Book of Hubble Images Allows the Visually Impaired to "Touch the Universe
Hands-On Book of Hubble Imag …
Title Hands-On Book of Hubble Images Allows the Visually Impaired to "Touch the Universe
Hubble Uncovers Oldest "Cloc …
Title Hubble Uncovers Oldest "Clocks" in Space to Read Age of Universe
General Information What is a Space Science Update? Major Hubble discoveries on NASA television ... Astronomers explain their Hubble discoveries at a press conference, called a Space Science Update (SSU), broadcast on NASA television. The SSU includes a question and answer session with members of the media. Back to top [ #top ]
Hands-On Book of Hubble Imag …
Title Hands-On Book of Hubble Images Allows the Visually Impaired to "Touch the Universe
Hubble Uncovers Oldest "Cloc …
Title Hubble Uncovers Oldest "Clocks" in Space to Read Age of Universe
General Information What is a Space Science Update? Major Hubble discoveries on NASA television ... Astronomers explain their Hubble discoveries at a press conference, called a Space Science Update (SSU), broadcast on NASA television. The SSU includes a question and answer session with members of the media. Back to top [ #top ]
Hands-On Book of Hubble Imag …
Title Hands-On Book of Hubble Images Allows the Visually Impaired to "Touch the Universe
Hubble Uncovers Oldest "Cloc …
Title Hubble Uncovers Oldest "Clocks" in Space to Read Age of Universe
General Information What is a Space Science Update? Major Hubble discoveries on NASA television ... Astronomers explain their Hubble discoveries at a press conference, called a Space Science Update (SSU), broadcast on NASA television. The SSU includes a question and answer session with members of the media. Back to top [ #top ]
Hubble Uncovers Oldest "Cloc …
Title Hubble Uncovers Oldest "Clocks" in Space to Read Age of Universe
General Information What is a Space Science Update? Major Hubble discoveries on NASA television ... Astronomers explain their Hubble discoveries at a press conference, called a Space Science Update (SSU), broadcast on NASA television. The SSU includes a question and answer session with members of the media. Back to top [ #top ]
Hands-On Book of Hubble Imag …
Title Hands-On Book of Hubble Images Allows the Visually Impaired to "Touch the Universe
Hubble Uncovers Oldest "Cloc …
Title Hubble Uncovers Oldest "Clocks" in Space to Read Age of Universe
General Information What is a Space Science Update? Major Hubble discoveries on NASA television ... Astronomers explain their Hubble discoveries at a press conference, called a Space Science Update (SSU), broadcast on NASA television. The SSU includes a question and answer session with members of the media. Back to top [ #top ]
Hands-On Book of Hubble Imag …
Title Hands-On Book of Hubble Images Allows the Visually Impaired to "Touch the Universe
Hands-On Book of Hubble Imag …
Title Hands-On Book of Hubble Images Allows the Visually Impaired to "Touch the Universe
Hands-On Book of Hubble Imag …
Title Hands-On Book of Hubble Images Allows the Visually Impaired to "Touch the Universe
Hands-On Book of Hubble Imag …
Title Hands-On Book of Hubble Images Allows the Visually Impaired to "Touch the Universe
Hands-On Book of Hubble Imag …
Title Hands-On Book of Hubble Images Allows the Visually Impaired to "Touch the Universe
Fast-Flying Black Hole Yield …
Title Fast-Flying Black Hole Yields Clues to Supernova Origin
Hands-On Book of Hubble Imag …
Title Hands-On Book of Hubble Images Allows the Visually Impaired to "Touch the Universe
Fast-Flying Black Hole Yield …
Title Fast-Flying Black Hole Yields Clues to Supernova Origin
Hands-On Book of Hubble Imag …
Title Hands-On Book of Hubble Images Allows the Visually Impaired to "Touch the Universe
Fast-Flying Black Hole Yield …
Title Fast-Flying Black Hole Yields Clues to Supernova Origin
Hands-On Book of Hubble Imag …
Title Hands-On Book of Hubble Images Allows the Visually Impaired to "Touch the Universe
Oldest Known Planet Identifi …
Title Oldest Known Planet Identified
General Information What is a NASA Science Update? Major Hubble discoveries on NASA television ... Astronomers explain their Hubble discoveries at a press conference, called a NASA Science Update (NSU), broadcast on NASA television. The NSU includes a question and answer session with members of the media. Back to top [ #top ]
Oldest Known Planet Identifi …
Title Oldest Known Planet Identified
General Information What is a NASA Science Update? Major Hubble discoveries on NASA television ... Astronomers explain their Hubble discoveries at a press conference, called a NASA Science Update (NSU), broadcast on NASA television. The NSU includes a question and answer session with members of the media. Back to top [ #top ]
Oldest Known Planet Identifi …
Title Oldest Known Planet Identified
General Information What is a NASA Science Update? Major Hubble discoveries on NASA television ... Astronomers explain their Hubble discoveries at a press conference, called a NASA Science Update (NSU), broadcast on NASA television. The NSU includes a question and answer session with members of the media. Back to top [ #top ]
Oldest Known Planet Identifi …
Title Oldest Known Planet Identified
General Information What is a NASA Science Update? Major Hubble discoveries on NASA television ... Astronomers explain their Hubble discoveries at a press conference, called a NASA Science Update (NSU), broadcast on NASA television. The NSU includes a question and answer session with members of the media. Back to top [ #top ]
Oldest Known Planet Identifi …
Title Oldest Known Planet Identified
General Information What is a NASA Science Update? Major Hubble discoveries on NASA television ... Astronomers explain their Hubble discoveries at a press conference, called a NASA Science Update (NSU), broadcast on NASA television. The NSU includes a question and answer session with members of the media. Back to top [ #top ]
Oldest Known Planet Identifi …
Title Oldest Known Planet Identified
General Information What is a NASA Science Update? Major Hubble discoveries on NASA television ... Astronomers explain their Hubble discoveries at a press conference, called a NASA Science Update (NSU), broadcast on NASA television. The NSU includes a question and answer session with members of the media. Back to top [ #top ]
Oldest Known Planet Identifi …
Title Oldest Known Planet Identified
General Information What is a NASA Science Update? Major Hubble discoveries on NASA television ... Astronomers explain their Hubble discoveries at a press conference, called a NASA Science Update (NSU), broadcast on NASA television. The NSU includes a question and answer session with members of the media. Back to top [ #top ]
Oldest Known Planet Identifi …
Title Oldest Known Planet Identified
General Information What is a NASA Science Update? Major Hubble discoveries on NASA television ... Astronomers explain their Hubble discoveries at a press conference, called a NASA Science Update (NSU), broadcast on NASA television. The NSU includes a question and answer session with members of the media. Back to top [ #top ]
Oldest Known Planet Identifi …
Title Oldest Known Planet Identified
General Information What is a NASA Science Update? Major Hubble discoveries on NASA television ... Astronomers explain their Hubble discoveries at a press conference, called a NASA Science Update (NSU), broadcast on NASA television. The NSU includes a question and answer session with members of the media. Back to top [ #top ]
Oldest Known Planet Identifi …
Title Oldest Known Planet Identified
General Information What is a NASA Science Update? Major Hubble discoveries on NASA television ... Astronomers explain their Hubble discoveries at a press conference, called a NASA Science Update (NSU), broadcast on NASA television. The NSU includes a question and answer session with members of the media. Back to top [ #top ]
Astronomers Find Smallest Ex …
Title Astronomers Find Smallest Extrasolar Planet Yet Around Normal Star
Heavyweight Stars Light Up N …
Title Heavyweight Stars Light Up Nebula NGC 6357
Heavyweight Stars Light Up N …
Title Heavyweight Stars Light Up Nebula NGC 6357
Heavyweight Stars Light Up N …
Title Heavyweight Stars Light Up Nebula NGC 6357
Heavyweight Stars Light Up N …
Title Heavyweight Stars Light Up Nebula NGC 6357
An unprecedented chart shows …
Description An unprecedented chart shows the true direction and apparent speed of a breeze of atoms, mainly hydrogen, that comes from the stars and blows right through the Solar System. In the solar spacecraft SOHO, built by the European Space Agency, the SWAN instrument detects a characteristic ultraviolet glow filling the sky, coming from the hydrogen atoms. Small shifts in the ultraviolet wavelength reveal the speed of the breeze. On a map of the whole sky, the windspeed is shown in relation to the direction from the Sun. A high negative velocity shown in purple depicts the incoming breeze, while in the orange parts of the chart the interstellar atoms are on their way out of the Solar System. In intermediate sectors they are moving sideways in relation to the Sun, so the radial speed is close to zero. White holes in the image are stars in the Milky Way emitting the same ultraviolet wavelength. An analysis based on two years of observations with SWAN defines the direction of the interstellar breeze more accurately than ever before. The source lies in the direction of the constellation Ophiuchus, close to Scorpius, and the night side of the Earth faces the breeze directly on 3 June each year. The SWAN instrument was provided for SOHO by the CNRS Service d'A[e/]ronomie at Verri[e\]res near Paris and the Finnish Meteorological Institute in Helsinki. SWAN has already charted the destruction (ionization) of interstellar hydrogen atoms by the impact of the solar wind coming from the Sun. Downwind of the Sun, they are almost entirely destroyed. That explains the difference in apparent windspeed, incoming and outgoing. The outgoing atoms detected in this study are far away, and have survived by giving the Sun a wide berth. They give a truer measure of the windspeed than the incoming atoms, which are accelerated by the Sun's gravity. Built in Europe for the European Space Agency, SOHO carries twelve sets of instruments provided by European and American investigators and it was despatched into space on 2 December 1995 by a NASA launcher. SOHO is a project of international cooperation between ESA and NASA. Credits: Main image: SOHO (ESA & NASA) and SWAN Consortium Star image: DSS/STScI/NASA
The Tycho Catalog Skymap
Title The Tycho Catalog Skymap
Abstract This image set is a skymap of stars from the Tycho and Hipparcos star catalogs. The maps are plotted in Platte-Carre projection (Cylindrical-Equidistant) using celestial coordinates making them suitable for mapping onto spheres in many popular animation programs. The stars are plotted as gaussian point-spread functions (PSF) so the size and amplitude of the stars corresponds to their relative intensity. The stars are also elongated in Right Ascension (celestial longitude) based on declination (celestial latitude) so stars in the polar regions will still be round when projected on a sphere. Stars fainter than the "threshold magnitude", usually selected as 5th magnitude, have their magnitude-intensity curve adjusted so they appear brighter than they really are. This makes the band of the Milky Way more visible. Stellar colors are assigned based on B and V magnitudes (B and V are stellar magnitudes measured through different filters). If Tycho B and V magnitudes are unavailable, Johnson B and V magnitudes are used instead. From these, an effective stellar temperature is derived using the algorithms described in Flower (ApJ 469, 355 1996). Corrections were noted from Siobahn Morgan (UNI). The effective temperature was then converted to CIE tristimulus X,Y,Z triples assuming a blackbody emission distribution. The X,Y,Z values are then converted to red-green-blue color pixels. About 2.4 million stars are plotted, but many may be below the pixel intensity resolution. The three most conspicuously missing objects on these maps are the Andromeda galaxy (M31) and the two Magellanic Clouds. [The images in this visualization were updated August 28, 2007 to fix a bug in the star generation algorithm.]
Completed 2007-08-14
M4: The Closest Known Globul …
Title M4: The Closest Known Globular Cluster
Explanation M4 is a globular cluster [ http://www.seds.org/messier/glob.html ] visible in dark skies about one degree west of the bright star Antares [ http://antwrp.gsfc.nasa.gov/apod/ap980726.html ] in the constellation [ http://www.astro.wisc.edu/~dolan/constellations/extra/constellations.html ] Scorpius [ http://www.astro.wisc.edu/~dolan/constellations/constellations/Scorpius.html ]. M4 is perhaps the closest globular cluster [ http://antwrp.gsfc.nasa.gov/apod/globular_clusters.html ] at 7000 light years [ http://www.treasure-troves.com/astro/Light-Year.html ], meaning that we see M4 [ http://www.seds.org/messier/m/m004.html ] only as it was 7000 years ago, near the dawn of recorded human history [ http://www.hyperhistory.com/online_n2/History_n2/a.html ]. Although containing hundreds of thousands of stars and spanning over 50 light-years, M4 [ http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1993MNRAS.265..395D ] is one of the smallest and sparsest globular clusters [ http://ast.leeds.ac.uk/research/gcs.html ] known. A particularly unusual aspect for a globular cluster is M4 [ http://www.astr.ua.edu/gifimages/m4v.html ]'s central bar of stars. M4, pictured above [ http://www.noao.edu/image_gallery/html/im0598.html ], is one of the oldest objects for which astronomers can estimate age directly. Cluster white dwarfs [ http://antwrp.gsfc.nasa.gov/apod/ap971102.html ] appear to be at least nine billion years old - so ancient they limit the youth of our entire universe [ http://www.astro.ucla.edu/~wright/cosmology_faq.html ].
Horse Head Shaped Reflection …
Title Horse Head Shaped Reflection Nebula IC 4592
Explanation Do you see the horse's head? What you are seeing is not the famous Horsehead nebula [ http://antwrp.gsfc.nasa.gov/apod/ap051130.html ] toward Orion but rather a fainter nebula that only takes on a familiar form with deeper imaging. The main part of the above imaged [ http://www.robgendlerastropics.com/IC4592JM.html ] molecular cloud [ http://antwrp.gsfc.nasa.gov/apod/ap060409.html ] complex is a reflection nebula [ http://en.wikipedia.org/wiki/Reflection_nebula ] cataloged as IC 4592 [ http://aisig.sdaa.org/astroblogDetail.asp?imgID=1035&UserID=66 ]. Reflection nebulas are actually made up of very fine dust [ http://antwrp.gsfc.nasa.gov/apod/ap030706.html ] that normally appears dark but can look quite blue when reflecting the light of energetic nearby stars. In this case, the source of much of the reflected light is a star at the eye of the horse. That star is part of Nu Scorpii [ http://en.wikipedia.org/wiki/Nu_Scorpii ], one of the brighter star systems toward the constellation of Scorpius [ http://www.astro.uiuc.edu/~kaler/sow/sco-t.html ]. A second reflection nebula [ http://antwrp.gsfc.nasa.gov/apod/reflection_nebulae.html ] dubbed IC 4601 is visible surrounding two stars on the far right.
IC 4628: The Prawn Nebula
Title IC 4628: The Prawn Nebula
Explanation South of Antares [ http://antwrp.gsfc.nasa.gov/apod/ap060714.html ], in the tail of the nebula-rich [ http://antwrp.gsfc.nasa.gov/apod/ap060628.html ] constellation Scorpius, lies emission nebula IC 4628 [ http://www.aao.gov.au/images/captions/aat105.html ]. Nearby hot, massive stars, millions of years young, radiate the nebula [ http://en.wikipedia.org/wiki/H_II_region ] with invisible ultraviolet light, stripping electrons from atoms. The electrons eventually recombine with the atoms to produce the visible nebular glow [ http://vis.sdsc.edu/research/hayden2.html ]. This narrow band [ http://antwrp.gsfc.nasa.gov/apod/ap060324.html ] image adopts a typical false-color mapping [ http://hubblesite.org/gallery/behind_the_pictures/ meaning_of_color/eagle.shtml ] of the atomic emission, showing hydrogen emission in green hues, sulfur as red and oxygen as blue. At an estimated distance of 6,000 light-years, the region shown is about 250 light-years across. The nebula is also cataloged as [ http://antwrp.gsfc.nasa.gov/apod/ap060519.html ] Gum 56 for Australian astronomer Colin Stanley Gum, but seafood-loving astronomers might know [ http://seds.lpl.arizona.edu/messier/xtra/supp/ d-names.html ] this cosmic cloud as The Prawn Nebula [ http://www.martinpughastrophotography.id.au/ Nebulae/IC4628.htm ].
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