Stars (apart from the Sun and Betelgeuse) only appear as point sources of light in telescopes, no mater how "powerful" the telescope. This is because they are a long way away. However we can see or Sun rotating by observing sunspots and we can do this similarly with Betelgeuse because it is so big it presents a disk. Similarly we can observe the rotation of pulsars (collapsed stars left after supernova explosions) by the beams they produce and the pulses these beams make as they sweep round during rotation.
With Star mass and age we need to look at the star's brightness and spectrum and obtain a measure as to how far away the star is from us (by parallax). This tells us what the stars surface is made of, it color and how bright is actually is.
We can then plot the star on the Hertzsprung-Russell diagram which will tell us its size/mass and potentially its age.
This is because stars start off fusing hydrogen into helium and once there is no hydrogen left in their cores they start fusing helium into heavier elements and get hotter and larger. This all becomes apparent on the Hertzsprung-Russell diagram and with a knowledge of nuclear physics we can determine the speed at which a star of a given mass will use up its hydrogen.
Huge Stars live only a few tens of millions of years, while small read dwarf stars will survive for a very long time.
The orbital period is 29.447498 years and the rotational period is 0.44401 days. These values are approximate, one can never know the exact figures.
Scientists learn the temperature of the stars light for exampleif the star is red- it's cold but it's blue- it's hot and if it's WHITE- IT'S VERY HOT ! that's how you know the temperate of stars (Determining the color)
We actually know about what the stars WERE like, since our telescopes are picking up the light that they gave off a very very long time ago.
Earth. i know because i took the test and it said the correct answer is earth ur welecome
You can see the moon in the sky, and scientists have sent people to the moon already.
they are made of helium and hydrogen scientists know this becuz of a spectrometer
not a clue
i do not know but i no that it is definetly not pluto!!
The orbital period is 29.447498 years and the rotational period is 0.44401 days. These values are approximate, one can never know the exact figures.
Taking your question as referring to the Sun, its rotation is inferred by measuring the velocity of sunspots on the Sun's surface. Or of other features such as prominences. The Sun's equator has a velocity of about 7 000km/h. At the equator the rotation period is about 28 days. At 16o latitude, the rotation period is about 25.4 days. At the poles, the rotation period is about 34.4 days.
Scientists don't "think" it was gravity, scientists know that it was gravity.
They have been located and identified as such by astronomical techniques.
Scientists learn the temperature of the stars light for exampleif the star is red- it's cold but it's blue- it's hot and if it's WHITE- IT'S VERY HOT ! that's how you know the temperate of stars (Determining the color)
Yes that is how scientists know when the next solar or lunar eclipse will be. this is due to the rotation of the earth around the sun...
We actually know about what the stars WERE like, since our telescopes are picking up the light that they gave off a very very long time ago.
For near-by stars, the parallax method is used - the star changes its apparent position due to Earth's movement around the Sun.
Let's say Michael Jordan (Is he still playing ? I never know.) Let's say Michael Jordan is walking around the arena spinning a basketball on the end of his finger. 'Rotation' is what the ball is doing on the end of his finger. The Earth's period of rotation is 1 day. 'Revolution' is what the ball is doing around the arena at the same time. The Earth's period of revolution is 1 year.