Astronomy

Hipparcos

artificial satellite

Solar Flare

astronomy

Ursa Major

constellation

Sextans

astronomy

Makemake

dwarf planet

Strömgren, Bengt

Danish astrophysicist

Keeler, James Edward

American astronomer

Cetus

constellation

Mädler, Johann Heinrich Von

German astronomer

Mohmand, Abdul Ahad

Afghan pilot and cosmonaut

Rosse, William Parsons, 3rd Earl Of

Telescope & Biography

Helms, Susan

Biography & Facts

Phobos-Grunt

Russian spacecraft

Pioneer

space probes

United States Naval Observatory

observatory, Washington, District of Columbia