Which star has the shortest lifetime?
So the total lifespan of a star with the mass of the Sun is about 10 billion years. The smallest stars are the red dwarfs, these start at 50% the mass of the Sun, and can be as small as 7.5% the mass of the Sun.
Do big stars live longer?
1) The bigger a star is, the longer it will live. 2) The smaller a star is, the longer it will live. … A smaller star has less fuel, but its rate of fusion is not as fast. Therefore, smaller stars live longer than larger stars because their rate of fuel consumption is not as rapid.
Which of these stars is the most massive?
Although R136a1 is the most massive known star, it is not the largest, since it only stretches about 30 times the radius of our sun. The largest known star is UY Scuti, a hypergiant with a radius somewhere around 1,700 times larger than the sun. Its mass, however, is only 30 times that of our nearest star.
What is the oldest star?
There is no question that the Methuselah star is old – indeed it is the oldest star in the universe for which there is a fairly precise estimate of its age.
Which color star is hottest?
Red stars are the coolest. Yellow stars are hotter than red stars. White stars are hotter than red and yellow. Blue stars are the hottest stars of all.
What is the average lifespan of a star?
Stars live different lengths of time, depending on how big they are. A star like our sun lives for about 10 billion years, while a star which weighs 20 times as much lives only 10 million years, about a thousandth as long. Stars begin their lives as dense clouds of gas and dust.
Why are stars so big?
A star is an enormous ball of hot gas, so massive that its gravity pulls it in on itself. This makes the star’s core extremely dense and hot. This triggers nuclear fusion, in which pairs of atoms smush together to form larger ones, generating lots of heat and pressure that pushes back outward.
How 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’.
What is the hottest star in the universe?
Only a few of them are visible to the naked eye, as most of this energetic radiation is ultraviolet, not visible. The Wolf-Rayet star WR 102 is the hottest star known, at 210,000 K.
What is a massive star?
Any star which is larger than eight solar masses during its regular main sequence lifetime is considered a massive star. … Massive stars are born, just like average stars, out of clouds of dust called nebulae. When a nebula collects enough mass, it begins to collapse under its own gravity.
What’s bigger than the sun?
Betelgeuse, a red giant, is about 700 times bigger than the sun and about 14,000 times brighter. “We have found stars that are 100 times bigger in diameter than our sun. Truly those stars are enormous,” NASA says on its SpacePlace website.
How old is our galaxy?
13.51 billion years
What color is the oldest star?
Throughout most of a star’s life, it is burning hydrogen at its core, which creates lots of energy and thus makes it appear blue. As stars age, they run out of hydrogen to burn, decreasing the amount of energy they emit.
What’s older than the universe?
Our Sun is about 4.5 billion years old. Since HD 140283 is a Population II star, it is older. In fact, it is the oldest star with a well-determined age. Because of this, astronomers colloquially call the star “the Methuselah star.” Initial estimates of its age were in excess of 14 billion years.