gravitational lensing

Astronomers use a galaxy cluster as an extremely powerful “natural telescope” to peer even farther into the universe

Astronomers use a galaxy cluster as an extremely powerful “natural telescope” to peer even farther into the universe

When it comes to studying some of the most distant and oldest galaxies in the Universe, a number of challenges present themselves. In addition to being billions of light years away, these galaxies are often too faint to see clearly. Luckily, astronomers have come to rely on a technique known as Gravitational Lensing, where the gravitational force of a large object (like a galactic cluster) is used to enhance the light of these fainter galaxies.

ESO Survey Shows Dark Matter To Be Pretty ''Smooth''

ESO Survey Shows Dark Matter To Be Pretty ''Smooth''

Dark Matter has been something of a mystery ever since it was first proposed. In addition to trying to find some direct evidence of its existence, scientists have also spent the past few decades developing theoretical models to explain how it works. In recent years, the popular conception has been that Dark Matter is “cold”, and distributed in clumps throughout the Universe, an observation supported by the Planck mission data.

Timeline: the history of gravity

Timeline: the history of gravity

Our understanding of gravity has gone through a few permutations, from Newton’s equations through to Einstein’s general relativity. With the discovery of gravitational waves, we look back on how our grasp of gravity has evolved over the centuries.

Caught in the act - Hubble captures first-ever predicted exploding star

Caught in the act - Hubble captures first-ever predicted exploding star

The NASA/ESA Hubble Space Telescope has captured the image of the first-ever predicted supernova explosion. The reappearance of the Refsdal supernova was calculated from different models of the galaxy cluster whose immense gravity is warping the supernova’s light.