The reason this is so cool and important is what this implies. That there is probably another extremely large object orbiting our sun so far away we can't see it. All we can see is the effect it has on Sedna, as it's immense mass causes a gravitational pull strong enough to pull Sedna's orbit into this weird shape.
Hot, young stars and cosmic pillars of gas and dust seem to crowd into NGC 7822. At the edge of a giant molecular cloud toward the northern constellation Cepheus, this glowing star forming region lies about 3,000 light-years away. Within the nebula, bright edges and complex dust sculptures dominate this detailed skyscape taken in infrared light by NASA's Wide Field Infrared Survey Explorer (WISE) satellite.
In MAVEN's first few weeks of instrument testing at the Red Planet, scientists have already created some of the most complete maps of atomic hydrogen, oxygen, carbon and ozone in the Martian atmosphere ever made. One of MAVEN's instruments even collected data as energetic particles blasted out by a massive solar eruption made it to Mars.
Comet Lovejoy, C/2014 Q2, is framed like a cosmic Christmas tree with starry decorations in this colorful telescopic portrait, snapped on December 16th. Its lovely coma is tinted green by diatomic C2 gas fluorescing in sunlight. Discovered in August of this year, this Comet Lovejoy is currently sweeping north through the constellation Columba, heading for Lepus south of Orion and bright enough to offer good binocular views. Not its first time through the inner Solar System, this Comet Lovejoy will pass closest to planet Earth on January 7,
When a star that is much more massive than out sun gets to the end of it's like it explodes into a Super Nova. A Super Nova can outshine and entire galaxy and radiate stellar matter at speeds up to 10% the speed of light. This particular Super Nova was given the name SN 1572. SN 1572 is also known as Tycho's Supernova, Tycho's Nova, "B Cassiopeiae" (B Cas), or 3C 10. This Super Nova is located in the constellation Cassiopeia. It is one of one of about eight supernovae visible to the naked eye in historical records. It burst forth in early November 1572 and was independently discovered by many individuals.