0
What else can I help you with?
What kind of person studies changes in the Earth that take place over millions and billions of years?
Scientist
How do distances between planets solar systems galaxies and the universe compare?
The distance between planets are measured in millions of kilometers while the distance between solar systems are measured in light years while the galxies and the universe are measured in AU (astronautical units)
How is the rock cycle?
Up To Millions And Billions Of years
Why are far distant galaxies not visibly younger and less well formed than nearer ones?
They actually are. Galaxies that are only millions of light years won't show much difference - that's too short compared to the age of galaxies. But there is definitely a trend in galaxies at distances of billions of light-years. Their metallicity is lower (i.e. they have had fewer supernovas to pollute the interstellar gas), and there is a greater percentage of disc galaxies (elliptical galaxies are thought to form by the collision of disc galaxies).
Does it sometimes take millions of years for starlight to reach earth?
Not for the stars you can see without a telescope. All of the stars you see at night are within a few hundred light years of Earth, so it does not take the light more than a few hundred years to reach us. There are stars in other galaxies that are millions or even billions of light years away. That light does take millions to billions of years to reach us, though the stars are too far away for us to thee them individually.
Billion of years ago galaxies existed?
It is a true statement that galaxies existed billions of years ago. It is estimated that planet Earth is approximately 4.54 billion years old.
Billions of years ago galaxies existed as what?
Hot clouds of dust and reactive gases
Billions of years ago galaxies existed in?
Galaxies. They are just about the same now as they were then. 14 Billion years ago, astronomers believe that the "Big Bang" created matter from energy, which is how they believe galaxies were formed.
Will you move into another galaxy?
Not in the near future. Other galaxies are hundreds of thousands, or millions, of light-years away; travelling at the speed of light, it would thus take millions of years to travel to most galaxies; travelling at a lower speed would, of course, take longer.Not in the near future. Other galaxies are hundreds of thousands, or millions, of light-years away; travelling at the speed of light, it would thus take millions of years to travel to most galaxies; travelling at a lower speed would, of course, take longer.Not in the near future. Other galaxies are hundreds of thousands, or millions, of light-years away; travelling at the speed of light, it would thus take millions of years to travel to most galaxies; travelling at a lower speed would, of course, take longer.Not in the near future. Other galaxies are hundreds of thousands, or millions, of light-years away; travelling at the speed of light, it would thus take millions of years to travel to most galaxies; travelling at a lower speed would, of course, take longer.
How long is the rock cycle?
Up To Millions And Billions Of years
How long does a yellow star live?
Millions or billions of years.
Is it possible that astronomers are discovering stars that no longer exists?
Likely only stars in other galaxies or ones that are already dying. Our galaxy is about 100,000 light years across, meaning it takes light from stars at one end 100,000 years to reach the other, which is a short time in the life of a star; most stars last billions of years while the most massive may last a few million. Other galaxies are millions to billions of light years away.
