| A | B |
|---|---|
| Which kind of star is most likely to spend the longest time on the main sequence? | a low-mass red star |
| Low-mass and medium-mass stars eventually turn into _______. | white dwarfs |
| What is a spinning neutron star emitting radio waves? | pulsar |
| The sun’s major source of fuel is _____. | hydrogen |
Which type of star has the longest main sequence 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 of these stars spends the least amount of time as a main sequence star?
type B stars are the hottest, so they would burn up more quickly, spending the least amount of time on the main sequence.
Which main sequence stars are 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.
Which stars leave the main sequence first?
The most luminous and massive stars, found in the upper left part of the main sequence, are the first to leave the main sequence; their turnoff point in the H-R diagram can be used to clock the age of the star cluster.
Which star has the shortest lifespan?
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.
How long will a star live?
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.
Is our sun a main sequence star?
Main sequence stars fuse hydrogen atoms to form helium atoms in their cores. About 90 percent of the stars in the universe, including the sun, are main sequence stars. These stars can range from about a tenth of the mass of the sun to up to 200 times as massive.
What is the star life cycle?
A star’s life cycle is determined by its mass. The larger its mass, the shorter its life cycle. A star’s mass is determined by the amount of matter that is available in its nebula, the giant cloud of gas and dust from which it was born.
How far away is a star whose parallax angle is 3 11 arc second?
How far away is a star whose parallax angle is 3/11 arc second? 11/3 parsecs.
What is the heaviest star in the universe?
The biggest: UY Scuti
It’s the case with Superman, as well as with supergiant stars — a fitting category for the largest known star in the universe, UY Scuti. One day, the Sun will become a red giant.
Which is the most massive star?
R136a1. The star R136a1 currently holds the record as the most massive star known to exist in the universe. It’s more than 265 times the mass of our Sun, more than double most stars on this list. Astronomers are still trying to understand how the star can even exist.
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 color is the hottest star?
White stars are hotter than red and yellow. Blue stars are the hottest stars of all. Stars are not really star-shaped.
What happens after main sequence star?
In general, the more massive a star is, the shorter its lifespan on the main sequence. After the hydrogen fuel at the core has been consumed, the star evolves away from the main sequence on the HR diagram, into a supergiant, red giant, or directly to a white dwarf.
What is the meaning of Zero Age Main Sequence?
Zero Age Main Sequence (ZAMS) is the time when a star first joins the main sequence on the Hertzsprung-Russell diagram (HR diagram) by burning hydrogen in its core through fusion reactions.