Size comparison of the two black holes imaged by the Event Horizon Telescope (EHT) Collaboration (IMAGE)
Caption
Size comparison of the two black holes imaged by the Event Horizon Telescope (EHT) Collaboration: M87*, at the heart of the galaxy Messier 87, and Sagittarius A* (Sgr A*), at the centre of the Milky Way. The image shows the scale of Sgr A* in comparison with both M87* and other elements of the Solar System such as the orbits of Pluto and Mercury. Also displayed is the Sun’s diameter and the current location of the Voyager 1 space probe, the furthest spacecraft from Earth. M87*, which lies 55 million light-years away, is one of the largest black holes known. While Sgr A*, 27 000 light-years away, has a mass roughly four million times the Sun’s mass, M87* is more than 1000 times more massive. Because of their relative distances from Earth, both black holes appear the same size in the sky. This project “TomoGrav”, hosted by Heriot-Watt University, aims to dynamically capture plasma swirling around these two completely different black holes with EHT. The project will enable filming of such 3D movies for a population of other black holes with a future mission extending EHT to space, including the proposed Black Hole Explorer (BHEX) mission.
Credit
Credit: EHT collaboration (acknowledgment: Lia Medeiros, xkcd)
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