Stars are objects that we see in the night sky, but what exactly are they? A star is simply an ordinary luminous spherical object made up of a rotating hydrogen atom held together by its particular gravity. The Sun is the nearest star to Earth. A few other stars can be seen easily to the unaided eye at night, although most other stars too are relatively far away from Earth. All other stars, once studied well enough, are classified into several groups depending on their peculiarities and relative positions in the night sky.
Astronomy is a field that involves the study of celestial objects to study their properties, including the positions and motions of stars. Ancient astronomers were the first to discover and record the positions and motions of several constellations. In the last few decades, a great number of amateur astronomers have become aware of the presence of these heavenly bodies through observatories on Earth and have made repeated measurements and calculations about the positions and motions of stars. The best-known ancient constellations are still visible to amateur astronomers through small telescopes. Many new and sophisticated telescopes on satellites now help astronomers better define and interpret the positions and motions of stars.
The most prominent and visible members of the solar system are the stars Vega, Altair, and Pollux. The other prominent members of the solar system are the planets Venus, Jupiter, Saturn, Uranus, Neptune, Rhea, and comets Halley and Hale-Bopp. In fact, many of the most spectacular stars in our own galaxy can be found in the outer regions of this vast cluster. The most common types of stars in a constellation are also those that are most frequently observed by amateur astronomers. These include the Sun, Gemini, Rahu, and Vega.