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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