WebA galaxy is a large collection of stars, dust, and gas held together by gravity. The smallest galaxies are known as dwarf galaxies and can contain as few as 100 million stars, while on the other ... WebFeb 22, 2024 · galaxy, any of the systems of stars and interstellar matter that make up the universe. Many such assemblages are so enormous that they contain hundreds of billions of stars. Nature has provided an …
Galaxy Formation and Evolution Center for Astrophysics
WebAug 27, 2024 · A galaxy can have millions or billions of stars. The nearest large galaxy to us, Andromeda, is 2.5 million light-years away. So, we see Andromeda as it was 2.5 million years in the past. The universe is filled … WebApr 13, 2024 · If galaxies were all the same size, that would give us 10 thousand billion billion (or 10 sextillion) stars in the observable universe. But the universe also seems to contain a bunch of matter and energy that we can’t see or directly observe. All the stars, planets, comets, sea otters, black holes and dung beetles together represent less than ... putnam county ohio genealogical society
What Is a Nebula? NASA Space Place – NASA Science for Kids
WebA galaxy is a collection of stars and planets that are held together by gravity. In a galaxy, the celestial bodies rotate around a central object. WebFeb 23, 2024 · Galaxies are vast cosmic islands of stars, gas, dust, and dark matter held together by gravity. Hubble’s keen eye has revealed intricate details of the shapes, structures, and histories of galaxies — … Webcluster of galaxies Local Supercluster supercluster, a group of galaxy clusters typically consisting of 3 to 10 clusters and spanning as many as 200,000,000 light-years. They are the largest structures in the universe. seghill middle school