哈勃太空望远镜
Happy #FourthOfJuly from Hubble! 🇺🇸 Stars shine red, white, and blue in this new Hubble image of globular cluster ESO 591-12, or Palomar 8. Globular clusters are spherical collections of tens of thousands to millions of stars bound tightly together by gravity. They are typically formed in gas and dust-rich regions of early galaxies. The multicolor appearance of the globular cluster is due to the differing temperatures of the stars. Hotter stars are bluer, giving off shorter wavelengths of light, and red stars are cooler, emitting longer wavelengths. Image description: Bright stars cluster against a black background. The stars are more densely concentrated in the center of the image. The stars appear mostly white, but bright red and blue stars are also visible sprinkled throughout the image. Image credit: NASA, ESA, and D. Massari (INAF — Osservatorio di Astrofisica e Scienza dello Spazio); Processing: Gladys Kober (NASA/Catholic University of America) #NASA #Hubble #FourthOfJuly #IndependenceDay #space #stars #astronomy #science #telescope #universe
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