当行星碰撞时会发生什么

当行星碰撞时会发生什么

ByNASA中文

This artist’s concept illustrates a catastrophic collision between two rocky exoplanets in the planetary system BD +20 307, turning both into dusty debris. Ten years ago, scientists speculated that the warm dust in this system was a result of a planet-to-planet collision. Now, NASA’s SOFIA mission found even more warm dust, further supporting that two rocky exoplanets collided. This helps build a more complete picture of our own solar system’s history. Such a collision could be similar to the type of catastrophic event that ultimately created our Moon. Image Credit: NASA/SOFIA/Lynette Cook 这幅艺术概念图描绘了BD +20 307行星系统中两颗岩质系外行星的灾难性碰撞，它们都变成了尘埃碎片。十年前，科学家们推测这个系统中的温暖尘埃是行星对行星碰撞的结果。现在，NASA的SOFIA任务发现了更多温暖的尘埃，进一步证明了两颗岩质系外行星相撞。这有助于我们更全面地了解太阳系的历史。这种碰撞可能类似于最终造成月球的灾难性事件。 来源：NASA/SOFIA/Lynette Cook

TESS在宜居带发现了第一颗地球大小的行星

TESS在宜居带发现了第一颗地球大小的行星

ByNASA中文

In a galaxy 100 light-years away in the constellation Dorado sits a planetary system named TOI 700. It is home to TOI 700 d, the first Earth-size habitable-zone planet discovered by TESS, NASA’s Transiting Exoplanet Survey Satellite. Image Credit: NASA/Goddard Space Flight Center 在离我们100光年的多拉多星系中，有一个名为TOI 700的行星系统。它是TOI 700d的家园，这是NASA凌日系外行星勘测卫星TESS发现的第一颗地球大小的适居带行星。 图片来源:NASA/Goddard Space Flight Center

下一步是测试将人类送上月球的火箭

下一步是测试将人类送上月球的火箭

ByNASA中文

On Jan.1, 2020, ​​NASA Administrator Jim Bridenstine tweeted: “Making progress! The massive @NASA_SLS core stage is moving to Building 110 at the Michoud Assembly Facility in Louisiana. There it will be readied for the Pegasus barge and its trip to @NASAStennis. Thank you to the @NASA team for working through the holidays!” NASA’s powerful new rocket, the Space Launch System (SLS), will send astronauts a quarter million miles from Earth to lunar orbit. The agency is committed to landing American astronauts, including the first woman and the next man, on the Moon by 2024. Through the agency’s Artemis lunar exploration program, we will use innovative new technologies and systems to explore more of the Moon than ever before. Image Credit: NASA/Jude L. Guidry 2020年1月1日，NASA局长吉姆·布莱恩斯汀在推特上写道：“取得进展！@NASA_SLS的大型核心阶段正在搬到路易斯安那州米却德装配厂的110号楼。那里将为飞马驳船及其旅行做好准备 @NASAStennis。感谢@NASA团队在假期期间的工作！”…

哈勃太空望远镜拍摄到了星系的天体亮片

哈勃太空望远镜拍摄到了星系的天体亮片

ByNASA中文

This smattering of celestial sequins is a spiral galaxy named NGC 4455, located in the northern constellation of Coma Berenices (Berenice’s Hair). This might sound like an odd name for a constellation — and in fact it is somewhat unusual. It’s the only modern constellation to be named in honor of a real person from history: Queen Berenice II of Egypt. The story of Queen Berenice II is an interesting one. A ruling queen of the ancient Greek city of Cyrene in modern-day Libya, and later a queen of Ptolemaic Egypt through her marriage to her cousin Ptolemy III Euergetes, Berenice became known for sacrificing locks of her hair as an offering to ensure her husband’s safe return from battle. Her husband did indeed return…

从空间站看到的闪闪发光的地球光

从空间站看到的闪闪发光的地球光

ByNASA中文

Stars glitter in the night sky above the Earth’s atmospheric glow, as the International Space Station orbited 260 miles above the Earth as it was about to cross over the Caspian Sea. Image Credit: NASA 国际空间站即将穿过里海，围绕地球260英里的上空运行，在地球大气辉光的上方，星星在夜空中闪烁。 影像来源：NASA

距离2300万光年的银河烟火

距离2300万光年的银河烟火

ByNASA中文

A galaxy about 23 million light years away is the site of impressive, ongoing fireworks. Rather than paper, powder and fire, this galactic light show involves a giant black hole, shock waves and vast reservoirs of gas. This galactic fireworks display is taking place in NGC 4258, also known as M106, a spiral galaxy like our own Milky Way. This galaxy is famous, however, for something that our galaxy doesn’t have – two extra spiral arms that glow in X-ray, optical and radio light. These features, or anomalous arms, are not aligned with the plane of the galaxy, but instead intersect with it. The anomalous arms are seen in this new composite image, where X-rays from NASA’s Chandra X-ray Observatory are blue, radio data from…

使用哈勃太空望远镜的考德威尔目录探索夜空

使用哈勃太空望远镜的考德威尔目录探索夜空

ByGotthew

During the 18th century, French astronomer Charles Messier compiled a list of over 100 cosmic objects that might fool fellow comet hunters into thinking they had discovered new comets. In the 1980s, an Englishman named Sir Patrick Moore produced an additional list to highlight more cosmic wonders visible to amateur astronomers. Unlike the Messier catalog, which only features objects that were visible from Charles Messier’s viewing location in Europe, Moore’s Caldwell catalog includes celestial bodies that are found in both the northern and southern skies. The catalog consists of 46 star clusters, 35 galaxies and 28 nebulas. Moore intentionally avoided including any of the Messier objects in his catalog, hoping to expand his fellow amateur astronomers’ cosmic horizons. From nearby clouds of gas and dust…

宇航员克里斯蒂娜·科赫准备再次创造历史

宇航员克里斯蒂娜·科赫准备再次创造历史

ByNASA中文

NASA astronaut Christina Koch makes observations from the International space Station’s cupola. Koch has already made history once in her stay aboard the orbital laboratory. In October 2019 she was part of the first all-female spacewalk and now she is poised to make history again. On Dec. 28, 2019, she will break the record for the longest single spaceflight by a woman, when she surpasses former Station Commander Peggy Whitson’s record. When she arrives back on Earth in February 2020, she will have spent more than 300 days in space. In this image from September 2019, Koch wrote on twitter: “#TBT to when Cygnus was docked and @AstroHague and I practiced for capturing Dragon by piloting the @Space_Station robotic arm. Soon we will capture the…

摩洛哥的小阿特拉斯山脉

摩洛哥的小阿特拉斯山脉

ByNASA中文

The Anti-Atlas Mountains of Morocco formed as a result of the collision of the African and Eurasian tectonic plates about 80 million years ago. This collision destroyed the Tethys Ocean. The limestone, sandstone, claystone and gypsum layers that formed the ocean bed were folded and crumpled to create the Anti-Atlas Mountains. In this image of southwest Morocco, visible, near infrared and short wavelength infrared bands are combined to dramatically highlight the different rock types, and illustrate the complex folding. The image was acquired on November 5, 2007, by the ASTER instrument on the Terra satellite. Terra launched 20 years ago in December 1999, beginning a new era in the study of Earth. Terra, flagship of the agency’s Earth Observing System, was built to last for…