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?
Look! A Lensing!
Gaia can do astrometry very well. And it turns out it can also help us observe lensings.
Reading the Epic of Reionization
Observations of dim galaxies lensed by foreground clusters provides a way of measuring the progression of reionization.
Measuring Masses with Microlensing: A White Dwarf Magnifying Glass
An exciting white dwarf microlensing event is predicted to happen on November 11th, 2019! Today’s paper explains how this prediction was made and what we could learn from the microlensing event about the mass-radius relation of white dwarfs.
Good vs. Evil: A Cosmic Challenge
Yes, even astronomers get competitive. Which team will develop the best method to measure the Hubble constant, H0, using information derived from strong gravitational lensing images?
Looking for Structure in Dark Matter with Gravitational Lensing
Will low mass dark matter halos discovered in gravitational lenses tell us about the nature of dark matter?