恒星吞噬行星

恒星吞噬行星

ByNASA中文

2023年6月6日 Star Eats Planet Illustrative Video Credit: K. Miller & R. Hurt (Caltech, IPAC) Explanation: It’s the end of a world as we know it. Specifically, the Sun-like star ZTF SLRN-2020 was seen eating one of its own planets. Although many a planet eventually dies by spiraling into their central star, the 2020 event, involving a Jupiter-like planet, was the first time it was seen directly. The star ZTF SLRN-2020 lies about 12,000 light years from the Sun toward the constellation of the Eagle (Aquila). In the featured animated illustration of the incident, the gas planet’s atmosphere is first pictured being stripped away as it skims along the outskirts of the attracting star. Some of the planet’s gas is absorbed into the star’s atmosphere, while…

飞马LL星的不寻常螺旋结构

飞马LL星的不寻常螺旋结构

ByNASA中文

2021年11月29日 The Extraordinary Spiral in LL Pegasi Image Credit: NASA, ESA, Hubble, HLA; Processing & Copyright: Jonathan Lodge Explanation: What created the strange spiral structure on the upper left? No one is sure, although it is likely related to a star in a binary star system entering the planetary nebula phase, when its outer atmosphere is ejected. The huge spiral spans about a third of a light year across and, winding four or five complete turns, has a regularity that is without precedent. Given the expansion rate of the spiral gas, a new layer must appear about every 800 years, a close match to the time it takes for the two stars to orbit each other. The star system that created it is most commonly…