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What does it mean when people look up at the stars and say seeing them how they were millions of years ago?
Generally speaking, this is a gross exaggeration. You see the stars as they were, at most, a few centuries ago. The reason is the light travels at a limited speed. In other words, it takes time to reach you. Distance between stars is measure in light years, which is the distance that light travels in a year. For example, if you look at a star that is 100 light years away, the light you see now left it 100 years ago. The stars you see at night are within the small part of our galaxy that is closest to us. Those stars are at most a few hundred light years away. A handful are less than 10 light years away. The only thing you can with the naked eye see as it was millions of years ago is the Andromeda galaxy, a massive collection of stars 2.5 million light years away. With a telescope you can see farther galaxies.
What else can I help you with?
When we look in the night sky are we seeing the universe as it is?
No. We are seeing as it was. The light we are seeing now was first emitted some time ago. We see the other planets in our solar system as they were a few minutes to a few hours ago. We see stars as they were a few years to a few centuries ago. We see other galaxies as they were millions to billions of years ago.
How is star gazing like time travel?
Star gazing can be compared to time travel because when we look at stars in the night sky, we are looking back in time due to the vast distances light has to travel to reach us. The light we see from stars can be thousands or millions of years old, so in a sense, we are seeing how those stars looked in the past. It's a way to connect with the history of the universe and experience a sense of time beyond our own.
Why does the position of stars seem to change as seasons change?
The earth is rotating around the sun. Therefore the position of other stars (although millions of light years away) are in different orientation to that of the earth.
What are the slowest stars to form?
The slowest stars to form are typically the lowest-mass stars, often referred to as red dwarfs. These stars form in dense molecular clouds and take a long time—often millions to tens of millions of years—to accumulate enough mass for nuclear fusion to begin. Their formation is characterized by a gradual buildup of material, leading to a longer and more extended process compared to more massive stars, which can ignite their nuclear processes relatively quickly.
What crystal is millions of years old?
Amber is a fossiled tree resin, which is millions of years old
How you can know some parts of the universe look a million years ago?
some of the stars we see in the universe took millions of years to get here - we are seeing what it looked like a million years ago.
What is the lifespan of most stars?
Millions Of Years
When we look in the night sky are we seeing the universe as it is?
No. We are seeing as it was. The light we are seeing now was first emitted some time ago. We see the other planets in our solar system as they were a few minutes to a few hours ago. We see stars as they were a few years to a few centuries ago. We see other galaxies as they were millions to billions of years ago.
Do stars with less mass live millions of years?
No. Low mass stars live hundreds of billions to trillions of years. The highest mass stars may live only a few million years.
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.
Why do people say looking at stars is like looking in the past?
Because the speed of light is finite (around 186,000 miles per second) and the stars are so distant, it takes a long time for the light to reach the telescope from the stars - at least 4.2 years. Many objects are millions of light years distant, meaning that what we see in the sky is from the distant past.
How long will wolf rayet stars burn?
Wolf-Rayet stars are massive stars that are very hot.Because of this they will be VERY short lived and will only have a life time of millions of years as apposed to "normal" stars like our own Sun which will survive for billions of years.
Do changes in stars take place over billions of year?
Yes, Millions/Billion(S) of years.
WHEN HAVE astronauts to exploreD a star?
its impossible to explore stars they're millions of miles away years in fact
How can you see stars if they are millions of light years away?
Because 1) they are very bright, most of them are bigger than our sun 2) light travels very quicky when you look at them, you are looking at the star about hundreds of millions of years ago, as that is how long it takes for the light to get to here.
Do stars go through a long life cycle?
Low mass stars can last for hundreds of billions of years. Medium mass stars, like our sun will remain on the main sequence for roughly ten billion years. High mass stars, will last for millions of years. By any human measure, a million years is a long time.
What was limestone called millions of years ago?
Nothing. While limestone existed millions of years ago there were no people to give it a name.
