Which of the following stars has the longest lifetime?
The stars with the longest lifetimes are red dwarfs; some may be nearly as old as the universe itself.
- Red Dwarf Stars. Astronomers define a red dwarf as a star having between about 0.08 and 0.5 times the mass of the sun and formed primarily of hydrogen gas. …
- Luminosity and Lifetime. …
- Nuclear Fusion. …
- Life Cycle of Stars.
24 апр. 2017 г.
Which star has the longest main sequence lifetime?
The Sun, a G-type star with a main sequence lifetime of ~ 10 billion years, is currently 5 billion years old – about half way through its main sequence lifetime.
Which of these star clusters is oldest?
A team of astronomers using the Gemini-South telescope has discovered one of the oldest stellar clusters in the Milky Way. The team’s results date the globular cluster, named HP 1, at about 12.8 billion years, making its stars among the oldest ever found in our Galaxy.
What type of star has the shortest lifespan?
The life span of stars ranges from about 10 million years for the blue giants to about 100 billion years for the red dwarfs. The most common type of star is the red dwarf (lower right); the least common type is the blue giant (upper left).
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.
How long is the 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.
Which type of stars are the youngest?
Yellow dwarfs are small, main sequence stars. The Sun is a yellow dwarf. A red dwarf is a small, cool, very faint, main sequence star whose surface temperature is under about 4,000 K. Red dwarfs are the most common type of star.
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| TYPE | Star |
|---|---|
| VII | White Dwarf |
Which Colour of star is the 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 type of visible star is the coolest?
- A red dwarf is the smallest and coolest kind of star on the main sequence. …
- The coolest red dwarfs near the Sun have a surface temperature of ~2,000 K and the smallest have radii of ~9% that of the Sun, with masses about ~7.5% that of the Sun.
What are star clusters called?
A star cluster is a group of stars that share a common origin and are gravitationally bound for some length of time. The two basic categories of stellar clusters are open clusters, also known as galactic clusters, and globular clusters. …
Which star has the largest radius?
The largest known star in the universe is UY Scuti, a hypergiant with a radius around 1,700 times larger than the sun. And it’s not alone in dwarfing Earth’s dominant star.
What are the two main types of star clusters?
Star cluster, either of two general types of stellar assemblages held together by the mutual gravitational attraction of its members, which are physically related through common origin. The two types are open (formerly called galactic) clusters and globular clusters.
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.
Do the brightest stars die first?
The more massive a star is, the brighter it burns, but the shorter it lives. While a star like our Sun might live around 10 billion years before reaching the end of its core fuel, these early stars live mere millions of years before they meet their demise.
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’.