NASAのインスタグラム(nasa) - 1月23日 00時25分

This stunning image, captured by the Hubble Space Telescope, shows part of the sky in the constellation of Sagittarius (The Archer). The region is rendered in exquisite detail - deep red and bright blue stars are scattered across the frame, set against a background of thousands of more distant stars and galaxies. Two features are particularly striking: the colors of the stars, and the dramatic crosses that burst from the centers of the brightest bodies. While some of the colors in this frame have been enhanced and tweaked during the process of creating the image from the observational data, different stars do indeed glow in different colors. Stars differ in color according to their surface temperature: very hot stars are blue or white, while cooler stars are redder. They may be cooler because they are smaller, or because they are very old and have entered the red giant phase, when an old star expands and cools dramatically as its core collapses.

Image credit: ESA/Hubble & NASA

#nasa #esa #space #hubble #hst #sagittarius #nasabeyond #astronomy #science

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