UY Scuti (BD-12°5055) is a red supergiant star, located 5,900 light-years away in the constellation Scutum. It is also a pulsating variable star, with a maximum brightness of magnitude 8.29 and a minimum of magnitude 10.56, which is too dim for naked-eye visibility. It is considered to be one of the largest known stars, with a radius estimated at 909 solar radii (632 million kilometres; 4.23 ...

Red supergiants (RSGs) are stars with a supergiant luminosity class (Yerkes class I) and a stellar classification K or M. [1] They are the largest stars in the universe in terms of volume, although they are not the most massive or luminous.

2025年1月20日 · NASA's James Webb Space Telescope unveils the mystery of "little red dots," identifying them as early-universe black holes growing within ancient galaxies.

2020年1月10日 · The very largest stars in our galaxy, all red supergiants, are about 1,500 times the size of our home star. Because of their immense size and mass, these stars require an incredible amount of energy to sustain them and prevent gravitational collapse.

2024年11月13日 · These scarlet star-makers — identified thanks to imaging and spectrograph data by the James Webb Space Telescope (JWST) — challenge long-held notions that supermassive galaxies formed only after much longer periods of time, the researchers said.

2024年9月17日 · Light from galaxies stretches to increasingly longer, redder wavelengths as it travels through an ever-expanding universe. About 13.8 billion years ago, our universe began with the big bang; but this initial, rapid expansion started to slow down almost instantaneously due to …

2024年11月19日 · But now there’s a new puzzle: three red monster galaxies from when the Universe was just 1 billion years old. Here’s what JWST found, and how astronomers and cosmologists are working to explain...

Betelgeuse is a red supergiant star in the constellation of Orion. It is usually the tenth-brightest star in the night sky and, after Rigel, the second brightest in its constellation. It is a distinctly reddish, semiregular variable star whose apparent magnitude, varying between +0.0 and +1.6, has the widest range displayed by any first-magnitude star. Betelgeuse is …

2025年1月15日 · Inside each of the “little red dot” galaxies spotted in the early Universe (largely by JWST), there appears to be both a UV-rest-frame component that is dominated by stars, as …

2021年8月4日 · Using observations from NASA’s Transiting Exoplanet Survey Satellite (TESS), astronomers have identified an unprecedented collection of pulsating red giant stars all across the sky. These stars, whose rhythms arise from internal sound waves, provide the opening chords of a symphonic exploration of our galactic neighborhood.