Hidden monster or spooky cosmological coincidence?
Two binary black hole mergers were detected within 20 minutes of each other. But does this mean that there were four black holes… or just two?
Two binary black hole mergers were detected within 20 minutes of each other. But does this mean that there were four black holes… or just two?
Gaia can do astrometry very well. And it turns out it can also help us observe lensings.
Will low mass dark matter halos discovered in gravitational lenses tell us about the nature of dark matter?
What do the sizes of galaxies have to tell us about cosmology? Today, we discuss how the velocity of a galaxy can change its observed size and tell us about the properties of the Universe.
A spectacular hit with the British public, has Stargazing Live generated an all time high interest in astronomy?
The authors discover a strong lensing arc behind an unusually massive galaxy cluster at high redshift. The existence of such a lensing system at high redshift is found to be inconsistent with the standard cosmological model.