Today in the history of astronomy, the second moon of Mars is discovered.

NGC 6910 is a bright open cluster in Cygnus the Swan, visible overnight as the Summer Triangle flies high around local ...

Today in the history of astronomy, a photo is shot. The moon Phoebe will be discovered in it months later.

The Last Quarter Moon floats in the predawn sky, preparing to occult the Pleiades from some parts of the world.

Space launch deregulation begins as President Trump signs order to relax FAA licensing and amend Part 450 rule to accelerate ...

The sidereal day is defined to be the length of time for the March equinox to return to your celestial meridian. Compare this ...

The waning Moon passes Jupiter, Venus, and Mercury before dawn, while Titan’s shadow transits Saturn in the sky this week.

The largest body in the main belt comes to a brief standstill in the sky, visible before sunrise in Cetus the Whale.

14. The Sun emits a continuous stream of plasma called the solar wind. On Earth, the most visible effect of the solar wind is ...

Today in the history of astronomy, the first photo of Earth by a satellite is taken.

The solar system’s smallest planet is just now becoming visible before dawn. Bright Jupiter and Venus point the way.

ULA Vulcan Launch completes its first National Security Space Launch mission, taking the reins from the Delta IV Heavy for ...