When a planet passes in front of a star, the starlight passes through the planet's atmosphere. Lines in the resulting spectrum occur where different elements absorb light at characteristic energies, indicating the composition of the planet's atmosphere.

The chance for a spooky Halloween comet sighting will not happen. The comet known as C/2024 S1 didn’t survive it’s rendezvous with the sun, as it broke apart at parahelion.

 

 For those in the Northern hemisphere, the next weeks are our best chance to see Comet A3, which came from the Oort Cloud, and won’t be back for 80,000 years

The constellations Carina, Vela, and Puppis make up Argo Navis, the mythical ship. Argo Navis was one of the 48 constellations listed in the Almagest.

A 13 year survey conducted by the VISTA telescope has created the most detailed map of the Milky Way ever. It contains an incredible 1.5 billion objects

The observable universe is the spherical region around Earth from which light has had time to reach us since the universe began. The boundary is called the cosmic light horizon.