Who is the founder of stars?
Characteristics of stars. Astronomers describe star brightness in terms of magnitude and luminosity. The magnitude of a star is based on a scale more than 2,000 years old, devised by Greek astronomer Hipparchus around 125 BC.
What is the history behind stars?
Ancient peoples first looked up thousands of years ago, and the stars were there; pinpoints of light that seemed to slowly rotate around the Earth. Early astronomers grouped the stars into constellations, and then used these to track the movement of the Sun and the planets.
Who are the founding fathers of astronomy?
There are five founding fathers of modern astronomy, and they are Galileo Galilei.Nicolaus Copernicus.Tycho Brake.Sir Issac Newton.Johannes Kepler.
How did the stars get in the sky?
First the cloud of gas and dust comes together, due to gravity, to form a protostar (a hot blob that is not quite a star but will eventually become a star) that takes thousands of years. Then the center of the blob becomes hot enough to give off visible light and most of the cloud of gas and dust has fallen into it.
Which star is the hottest?
But the hottest known stars in the Universe are the blue hypergiant stars. These are stars with more than 100 times the mass of the Sun. One of the best known examples is Eta Carinae, located about 7,500 light-years from the Sun.
Why do I see a star moving?
Youre absolutely right that stars twinkle — and sometimes appear to move around — due to our atmosphere “scrambling” their light as it travels from the top of Earths atmosphere to the ground. This phenomenon, also called scintillation, tends to occur more obviously in bright stars.
Which color of the star is hottest?
Blue stars White stars are hotter than red and yellow. Blue stars are the hottest stars of all.
Do stars twinkle?
As light from a star races through our atmosphere, it bounces and bumps through the different layers, bending the light before you see it. Since the hot and cold layers of air keep moving, the bending of the light changes too, which causes the stars appearance to wobble or twinkle.
Why is a star moving so fast?
The principal movement of the stars within the disk portion of the Galaxy is the Keplerian motion: the closer the star is to the gravitational center (the nucleus of the Galaxy), the faster it moves.