The Hubble Space Telescope has captured a new image of a strange transparent galaxy called NGC 1052DF2, which appears to be devoid of dark matter. This galaxy was discovered in 2018 and is almost as wide as the Milky Way, but contains only about 0.5% of the number of stars. The galaxy has no visible center or structure, and it is so scattered that it can be used to see more distant galaxies. Recent observations of
using Hubble’s Advanced Sky Survey Camera between December 2020 and March 2021 indicate that the galaxy contains only 0.25% of the mass of dark matter expected by astronomers. Unlike other galaxies, in the case of NGC 1052DF2, the visible stars appear to occupy almost all the matter in the galaxy, this can be calculated by observing the dynamic process within the galaxy.
Astronomers focused on the brightness of the red giant stars in the Milky Way to calculate their distance from the Earth. Compared with previous estimates, they now believe that the galaxy is 72 million light-years farther away than the previous estimate of 42 million light-years. Tereza Pultarova
Wow, Ingenuity did it again… The
Ingenuity helicopter captured its shadow on the eighth flight.
(Image source: NASA)
Tuesday, June 22, 2021: The Ingenuity helicopter captured its shadow during its eighth successful flight over Mars on Monday (June 21,
). 4 pounds. NASA said on Twitter that the drone weighs (1.8 kg), flew for 77.4 seconds during the flight, flew over a distance of 160 meters, and landed at a new landing site about 133.5 meters from the Hengxin rover. . The
helicopter was connected to the belly of Perseverance and headed to Mars. The first “Brothers Wright” moment ushered on Mars in April. Since then, the flight distance and maneuver complexity have gradually increased. The eighth flight covered the third longest distance, but it was the fourth shortest flight so far.