What did Cecilia Payne gaposchkin do?
7, 1979, Cambridge, Mass., U.S.), British-born American astronomer who discovered that stars are made mainly of hydrogen and helium and established that stars could be classified according to their temperatures. Payne entered the University of Cambridge in 1919.
Who discovered what stars are?
Galileo Galilei, an Italian scientist, lived from 1564 to 1642. In 1610, he was the first person we know of to use the newly invented telescope to look at the stars and planets.
What is the the biggest star?
UY Scuti
Why does a star die?
Stars die because they exhaust their nuclear fuel. Really massive stars use up their hydrogen fuel quickly, but are hot enough to fuse heavier elements such as helium and carbon. Once there is no fuel left, the star collapses and the outer layers explode as a ‘supernova’.
How are stars born?
Stars are born within the clouds of dust and scattered throughout most galaxies. A familiar example of such as a dust cloud is the Orion Nebula. Turbulence deep within these clouds gives rise to knots with sufficient mass that the gas and dust can begin to collapse under its own gravitational attraction.
Is the Milky Way still forming stars?
Like most spiral galaxies, the Milky Way has a roughly spherical collection of stars at its center called the bulge. New research finds that the majority of stars in our galaxy’s central bulge formed in a single burst of star formation more than 10 billion years ago.
Do stars shine forever?
Most of a star’s lifetime is spent shining bright. It gets its energy from nuclear fusion reactions at its core. A star will shine bright until all the hydrogen at its core has been converted to helium. Then it begins to die.
How stars are born and die?
Stars are born when large gas clouds collapse under gravity. When it eventually dies, it will expand to a form known as a ‘red giant’ and then all the outer layers of the Sun will gradually blow out into space leaving only a small White Dwarf star behind about the size of the Earth.
How many galaxies are they?
Several thousand galaxies, each consisting of billions of stars, are in this small view. XDF (2012) view: Each light speck is a galaxy, some of which are as old as 13.2 billion years – the observable universe is estimated to contain 200 billion to two trillion galaxies.
Why are there 52 stars on the American flag?
U.S. Flag Facts There are 50 stars representing the 50 states and there are 13 stripes representing the 13 original colonies. from The CIA World Factbook.
Is Puerto Rico a state of the United States?
The political status of Puerto Rico is that of an unincorporated territory of the United States. As such, the island of Puerto Rico is neither a sovereign nation nor a U.S. state.