Two methods of measuring the mass of a galaxy

This infographic compares the two methods used to measure the mass of the galaxy ESO 325-G004. The first method used ESO’s Very Large Telescope to measure the velocities of stars in ESO 325-G004. The second method used the NASA/ESA Hubble Space Telescope to observe an Einstein ring caused by light from a background galaxy being bent and distorted by ESO 325-G004. By comparing these two methods of measuring the strength of the gravity of ESO 325-G004, it was determined that Einstein’s general theory of relativity works on extragalactic scales — something that had not been previously tested.

Credit:

ESA/Hubble, ESO, NASA

About the Image

Id:heic1812c
Type:Artwork
Release date:21 June 2018, 20:00
Related releases:heic1812
Size:6251 x 4429 px

About the Object

Name:ESO 325-G004
Type:Early Universe : Galaxy
Category:Galaxies

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