Signal hints at possible interactions between ordinary hydrogen and dark matter in the early universe, but some scientists remain skeptical.
About 100 years ago Henrietta Swan Leavitt helped prove the existence of other galaxies. She is still inspiring astronomers today (infographic).
Even some of the most powerful explosions in the universe might be explained by the collision of magnetic fields.
The giant black hole is one of the biggest ever observed from this far back in time.