A star will spend most of its lifetime turning hydrogen into helium in its core; this nuclear reaction releases energy and makes the star shine. During this phase,
a given star’s colour and magnitude remain essentially the same
(we call this phase of a star’s life the main sequence phase).
How does the size of a star affect its lifespan?
Explanation: If the star has smaller mass than the Sun, it can fuse hydrogen into helium for atleast a trillion years.
The larger a star, the shorter its life because it fuses hydrogen into helium much more quickly
. A star whose mass is more than 20 Suns will run out of hydrogen in only a few hundred million years.
How do stars change over their life cycle?
A smaller star, like the Sun, will gradually cool down and stop glowing
. During these changes it will go through the planetary nebula phase, and white dwarf phase. After many thousands of millions of years it will stop glowing and become a black dwarf. A massive star experiences a much more energetic and violent end.
How do R magnitudes relate to brightness?
Any filters can be used for color indices, but some of the most common are B – V and V – R. B is blue wavelengths, V is green wavelengths and R is red wavelengths. Remember that
magnitudes decrease with increasing brightness
, so if B – V is small, the star is bluer (and hotter) than if B – V is large.
What is the life cycle of a star?
Massive stars transform into supernovae, neutron stars and black holes while average stars like the sun, end life as a white dwarf surrounded by a disappearing planetary nebula. All stars, irrespective of their size, follow the same 7 stage cycle, they
start as a gas cloud and end as a star remnant
.
How is a star’s life cycle different from the life cycle of a human?
How does the life cycle of humans compare to the life cycle of a star? They both have stages where they are born and die which is in the main sequence and supernova and
in a human they are born in a womb and die of old age
. … A star is an extremely hot ball of gas with hydrogen fusing into helium.
Why massive star has shorter lifespan than average star?
Massive stars live shorter lives than the common small stars because
even though they have a larger amount of hydrogen for nuclear reactions, their rate of consuming their fuel is very much greater
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What the differences are between a high mass and low mass star’s life cycle?
Both, a low mass Star and a High mass Star will Start off with fusing hydrogen into Helium, though a high mass Star will burn it faster because of increased pressure and temperature in the core. A second difference is
the ability to create heavier elements
.
Why do average stars have longer lifespan?
A star’s life expectancy depends on its mass. Generally,
the more massive the star, the faster it burns up its fuel supply, and the shorter its life
. The most massive stars can burn out and explode in a supernova after only a few million years of fusion.
Can the life cycle of a star be studied directly?
Basically,
it is very difficult to pin down an individual star’s age
. It has taken astronomers most of this century to piece together the life cycles of stars, simply because we cannot live long enough to follow a single star through its life cycle.
How does magnitude work in astronomy?
magnitude, in astronomy, measure of the brightness of a star or other celestial body.
The brighter the object, the lower the number assigned as a magnitude
. In ancient times, stars were ranked in six magnitude classes, the first magnitude class containing the brightest stars.
How do star magnitudes work?
Modern astronomy has added precision to the magnitude scale.
A difference of 5 magnitudes corresponds to a brightness factor of a hundredfold
. So a 1st-magnitude star is 100 times brighter than a 6th-magnitude star. Or, conversely, a 6th-magnitude star is 100 times dimmer than a 1st-magnitude star.
Why do the stars have two different magnitudes?
Because less light translates to a larger magnitude value
, for B–V colors a negative value means that the blue magnitude is a smaller number, and thus that the star is brighter at blue than at visual wavelengths. We call the stars with the smallest B–V color “blue”, and those with the largest B–V magnitudes “red”.
Why a star is stable during the main sequence period of its life cycle?
A star forms when it is hot enough for nuclear reactions to start. This releases energy, and keeps the star hot. During the main sequence period of its life cycle, a star is stable
because the forces in it are balanced
. The outward pressure from the expanding hot gases is balanced by the force of the star’s gravity.
At which stage does a star spend most of it’s life?
The
main sequence phase
is where stars spend the majority of their “life” by fusing hydrogen into helium.
How does the mass of a star impact its life cycle quizlet?
The less mass burns less gas as fast as the greater mass
. Stars that have less mass than the sun use their fuel slowly, and can live up to 200billion years. Medium-mass stars, like the sun, can live up to about 10 billion years. The sun is about halfway through its lifetime.
What happens at the end of a stars life?
The events at the end of a star’s life depend on its mass. 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’.
Why do less massive stars have a longer lifespan than large massive stars?
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 does the life of a high mass star differ from the sun’s life?
How does the life of a high-mass star differ from the Sun’s life? –
It forms much faster
. -It lives a shorter time on the main sequence. -As a red giant or supergiant, it makes elements heavier than carbon.
What is the life cycle of a low mass star?
After about 100 million years, the star fuses all its core helium into carbon. Then a helium fusion shell forms around this core, and the hydrogen fusion shell remains around that. It then becomes a red giant again and remains like this for a few million years with its outer layers continuing to expand.
Why does a high mass star evolve differently from a low mass star?
mass. Why does a high-mass star evolve differently from a low-mass star?
It can fuse additional elements because its core can get hotter
. protostar, main sequence, red giant, white dwarf.
