Remove

1. ALTAIR
2. Earth
3. Arizona

What

1. Sun (2)
2. Hubble Space Te … (2)
3. Canis Major (2)
4. SIRIUS (2)

Where

1. Washington, D.C … (2)
2. Germany (2)

When

1. 2004 (2)
2. 2003 (2)
3. 2005 (2)
4. February 2004 (2)
5. October 2003 (2)