Astronomers studied 320 galaxy clusters, the largest structures in the universe held together by gravity, to find information about the nature of dark energy.
A giant star with radius 200 times larger than our sun, exploded into a supernova, 30 million years ago. Although it was one of the closest to Earth explosions in recent years, its distance was large enough that the light from the explosion took 30 million years to arrive to us. The massive explosion was visible from the Earth as a point like in the night sky, starting July 24th, 2013.
Hitomi, the most sensitive X-ray satellite, lost communication with Earth on 26th of March, only about a month after its launch. Now scientists believe that a basic engineering error might be the cause of the failure