![]() ![]() The more massive a star, the shorter its lifespan.The view of Alpha Centauri is 4.3 years old, while the appearance of Sirius is more than 8 years old. The Sun appears as it was 8.5 minutes ago. ![]() When you look at a star (or any object in space) you are seeing how it looked in the past.But not all stars do that our Sun, for example, moves through the galaxy without a stellar companion. Most stars travel the galaxy with companions or in clusters.Over time, they travel through the Milky Way, far from their crèches. Stars are born in batches in their stellar nurseries.Astronomers estimate there are a trillion stars in the Milky Way Galaxy.To do this, you need to observe on a moonless night and be far away from sources of light pollution. You can only see about 2,000 stars on a very dark night with the naked eye from any given place on Earth. ![]() To see more, you have to use a telescope to reveal stars fainter than your eyes can see. There are 9,096 stars visible to the naked eye in the entire sky.Stars are the main components of galaxies, and were among the first objects to form in the early universe. The energy is also released as heat and light, which are radiated out to space. That process releases energy, which pushes against the weight of the outer layers of the star and keeps it stable. ![]() They are made mostly of hydrogen, which stars fuse in their cores. Stars are luminous spheres made of plasma – a superheated gas threaded with a magnetic field. ![]()
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