Remove

1. Advanced Camera fo …
2. I Zwicky 18

What

1. Hubble Space Te … (3)
2. Ursa Major (3)
3. COMPASS (3)
4. Earth (2)

Where

1. Washington, D.C … (3)
2. Milky Way Galax … (2)
3. Italy (2)
4. dwarf galaxy (1)

When

1. 2005 (2)
2. 2006 (2)
3. 2007 (2)
4. January 2006 (2)
5. October 2005 (2)