Astronomers have discovered the largest explosions since the Big Bang. These extreme nuclear transients are massive stars getting destroyed by black holes.
Newly combined data shows Andromeda and Milky Way galaxies might not collide as previously assumed. The research puts chances of a galactic collision at 50/50.
A new study says that Dyson spheres - and, similarly, ringworlds - could be stable in a two-star system. Read more about them and their impact on SETI.
What are the mysterious dark streaks on Mars seen flowing down steep slopes? A new study using machine learning suggests they are caused by dry dust, not water.