No one yet knows the exact number of stars: knowing how many stars there are in the whole universe is impossible; it would be like wanting to know how many grains of sand there are on a beach, without being able to count them one by one. About 4,000 stars are visible to the naked eye. With modern telescopes, an estimated 50 billion galaxies are visible, only a few thousand of which have been studied. Each of these galaxies contains very many stars: in fact, the larger ones are formed by trillions of them, and the smaller ones, i.e., "dwarf" galaxies, comprise millions of them.
The Big Dipper or Ursa Major
Milky Way
Our galaxy
Observatory and starry sky
The Horsehead Nebula
Lagoon Nebula M8
Swan Nebula
Trifid Nebula
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