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Hubble Sees Early Building B …
Title Hubble Sees Early Building Blocks of Today's Galaxies
Hubble Spies Globular Cluste …
Title Hubble Spies Globular Cluster in Neighboring Galaxy
Deepest View of Space Yields …
Title Deepest View of Space Yields Young Stars in Andromeda Halo
Deepest View of Space Yields …
Title Deepest View of Space Yields Young Stars in Andromeda Halo
Deepest View of Space Yields …
Title Deepest View of Space Yields Young Stars in Andromeda Halo
Deepest View of Space Yields …
Title Deepest View of Space Yields Young Stars in Andromeda Halo
Deepest View of Space Yields …
Title Deepest View of Space Yields Young Stars in Andromeda Halo
Deepest View of Space Yields …
Title Deepest View of Space Yields Young Stars in Andromeda Halo
Deepest View of Space Yields …
Title Deepest View of Space Yields Young Stars in Andromeda Halo
Deepest View of Space Yields …
Title Deepest View of Space Yields Young Stars in Andromeda Halo
Deepest View of Space Yields …
Title Deepest View of Space Yields Young Stars in Andromeda Halo
Deepest View of Space Yields …
Title Deepest View of Space Yields Young Stars in Andromeda Halo
Deepest View of Space Yields …
Title Deepest View of Space Yields Young Stars in Andromeda Halo
Deepest View of Space Yields …
Title Deepest View of Space Yields Young Stars in Andromeda Halo
Deepest View of Space Yields …
Title Deepest View of Space Yields Young Stars in Andromeda Halo
Hubble Finds Mysterious Disk …
Title Hubble Finds Mysterious Disk of Blue Stars Around Black Hole
Hubble Finds Mysterious Disk …
Title Hubble Finds Mysterious Disk of Blue Stars Around Black Hole
Hubble Finds Mysterious Disk …
Title Hubble Finds Mysterious Disk of Blue Stars Around Black Hole
Hubble Finds Mysterious Disk …
Title Hubble Finds Mysterious Disk of Blue Stars Around Black Hole
Hubble Finds Mysterious Disk …
Title Hubble Finds Mysterious Disk of Blue Stars Around Black Hole
Hubble Finds Mysterious Disk …
Title Hubble Finds Mysterious Disk of Blue Stars Around Black Hole
Hubble Finds Mysterious Disk …
Title Hubble Finds Mysterious Disk of Blue Stars Around Black Hole
Hubble Finds Mysterious Disk …
Title Hubble Finds Mysterious Disk of Blue Stars Around Black Hole
Hubble Finds Mysterious Disk …
Title Hubble Finds Mysterious Disk of Blue Stars Around Black Hole
Hubble Space Telescope Finds …
Title Hubble Space Telescope Finds a Double Nucleus in the Andromeda Galaxy
Hubble Space Telescope Finds …
Title Hubble Space Telescope Finds a Double Nucleus in the Andromeda Galaxy
Core of the Globular Cluster …
Title Core of the Globular Cluster NGC 6624
Hubble Observations Support …
Title Hubble Observations Support Black Hole Explanation For Active Galaxies
Core of the Globular Cluster …
Title Core of the Globular Cluster NGC 6624
Hubble Space Telescope Image …
Name of Image Hubble Space Telescope Image of NGC 4676, "The Mice
Date of Image 2002-04-07
Full Description The Advanced Camera for Surveys (ACS), the newest camera on the Hubble Space Telescope, has captured a spectacular pair of galaxies. Located 300 million light-years away in the constellation Coma Berenices, the colliding galaxies have been nicknamed "The Mice" because of the long tails of stars and gas emanating from each galaxy. Otherwise known as NGC 4676, the pair will eventually merge into a single giant galaxy. In the galaxy at left, the bright blue patch is resolved into a vigorous cascade of clusters and associations of young, hot blue stars, whose formation has been triggered by the tidal forces of the gravitational interaction. The clumps of young stars in the long, straight tidal tail (upper right) are separated by fainter regions of material. These dim regions suggest that the clumps of stars have formed from the gravitational collapse of the gas and dust that once occupied those areas. Some of the clumps have luminous masses comparable to dwarf galaxies that orbit the halo of our own Milky Way Galaxy. Computer simulations by astronomers show that we are seeing two near identical spiral galaxies approximately 160 million years after their closest encounter. The simulations also show that the pair will eventually merge, forming a large, nearly spherical galaxy (known as an elliptical galaxy). The Mice presage what may happen to our own Milky Way several billion years from now when it collides with our nearest large neighbor, the Andromeda Galaxy (M31). This picture is assembled from three sets of images taken on April 7, 2002, in blue, orange, and near-infrared filters. Credit: NASA, H. Fort (JHU), G. Illingworth (USCS/LO), M. Clampin (STScI), G. Hartig (STScI), the ACS Science Team, and ESA.
The Andromeda Deep Field
Title The Andromeda Deep Field
Explanation What can you learn from looking into the depths of space? In an effort to find out true ages of stars in neighboring Andromeda galaxy [ http://antwrp.gsfc.nasa.gov/apod/ap021021.html ]'s halo [ http://csep10.phys.utk.edu/astr162/lect/milkyway/components.html ], astronomers stared into the galaxy giant [ http://www.seds.org/messier/m/m031.html ] with the new Advanced Camera for Surveys [ http://acs.pha.jhu.edu/ ] through the Hubble Space Telescope [ http://www.stsci.edu/hst/HST_overview/ ]. The resulting exposure [ http://www.astronomy.com/Content/Dynamic/Articles/000/000/001/321vkity.asp ] of over three days, shown above [ http://hubblesite.org/newscenter/archive/2003/15/image/a ], is the deepest exposure in visible light ever taken, although shorter in duration than the multi-wavelength effort toward the Hubble Deep Field [ http://antwrp.gsfc.nasa.gov/apod/ap020901.html ]. The final image illuminated not only Andromeda [ http://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search?M31 ] (M31) but the distant universe. Andromeda's halo stars [ http://skyandtelescope.com/news/article_949_1.asp ] turned out to be have a wider range of ages than our Milky Way [ http://antwrp.gsfc.nasa.gov/apod/milky_way.html ]'s halo stars, likely indicating more encounters with small neighboring galaxies [ http://antwrp.gsfc.nasa.gov/apod/ap991003.html ]. Visible on the above [ http://hubblesite.org/newscenter/archive/2003/15/ ] left is one of Andromeda's globular star clusters [ http://www.seds.org/messier/glob.html ], while literally thousands of background galaxies are seen in the distance universe [ http://antwrp.gsfc.nasa.gov/apod/ap030126.html ], far beyond M31.
M32: Blue Stars in an Ellipt …
Title M32: Blue Stars in an Elliptical Galaxy
Explanation Elliptical galaxies [ http://antwrp.gsfc.nasa.gov/apod/ap961106.html ] are known for their old, red stars. But is this old elliptical [ http://www.seds.org/messier/elli.html ] up to new tricks? In recent years, the centers of elliptical galaxies [ http://www.windows.umich.edu/cgi-bin/tour.cgi?link=/the_universe/Ellipticals.html ] have been found [ http://antwrp.gsfc.nasa.gov/apod/ap991103.html http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1998AJ....116.2297P ] to emit unexpectedly high amounts of blue and ultraviolet light [ http://imagine.gsfc.nasa.gov/docs/science/know_l1/emspectrum.html ]. Most blue light from spiral galaxies [ http://antwrp.gsfc.nasa.gov/apod/ap990926.html ] originates from massive young hot stars [ http://antwrp.gsfc.nasa.gov/apod/ap991103.html ap981025.html ], in contrast to the red light from the old cool stars thought to compose ellipticals. In the above recently released, false-color photograph [ http://oposite.stsci.edu/pubinfo/pr/1999/40/pr-photos.html ] by the Hubble Space Telescope [ http://www.stsci.edu/hst/ ], the center of nearby dwarf elliptical M32 has actually been resolved and does indeed show thousands of bright blue stars. The answer [ http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1999AAS...194.0713B ] is probably that these blue stars [ http://oposite.stsci.edu/pubinfo/pr/1999/40/index.html ] are also old and glow blue, reaching relatively high temperatures by the advanced process [ http://zebu.uoregon.edu/textbook/se.html ] of fusing helium [ http://antwrp.gsfc.nasa.gov/htmltest/gifcity/msblues.html ], rather than hydrogen [ http://antwrp.gsfc.nasa.gov/apod/lib/glossary.html#hydrogen ], in their cores. M32 [ http://antwrp.gsfc.nasa.gov/apod/ap960106.html ] appears in many pictures as the companion galaxy to the massive Andromeda Galaxy [ http://antwrp.gsfc.nasa.gov/apod/ap971101.html ] (M31).
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