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What else can I help you with?
What happens if you could travel at the speed of light or faster?
you would never get old, but you wouldn't be able to see yourself
What is a light year and explain it using a suitable example which talks about position of stars?
A light year, is the distance that you would travel in one year if you were traveling at light speed. It is equal to about 6 trillion miles and 9 trillion kilometers. It doesn't really deal with the position of the stars but their distances from earth. Example: Sirius is about 8 light years from earth. If you traveled at light speed in its direction, you would arrive in about 8 years.
Can visible light travel through space?
Light can travel through space. All the light that we get on the earth's surface; usually travels from the sun through space before it can reach here.
Why cant we see stars during the day?
The stars are not visible during the day because bight sunlight scattered by the atmosphere masks the relatively dim light of the stars.
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.
How do we know light can travel through outer space?
We can see stars.
Why is light you see from stars several years old?
it takes light long to travel so you see it late
Can light waves travel on a vacuum?
I think they can, since that's how you see the sun and the stars.
Can a light travel through a vacuum?
Yes. Refer to stars - space is a vaccuum (though not a perfect vaccuum) and because light can travel through a vaccuum, we have day and night here on Earth. We can even see light from other stars light years away.
Are we looking at the past when we observe stars?
Yes, when we observe stars, we are looking at the past because the light from stars takes time to travel to Earth, so we see them as they were in the past.
If you were travelling faster than light could you still see an object in front of you?
You cannot travel at the speed of light. Period.
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.
Why you can see the stars?
we an see the stars because stars give out light.
Is there light in outerspace?
You mean, light such as comes from stars like the Sun? That kind of light? In outer space, where the stars are? In that big vast open place that the light has to travel across before we see it ? Gee, that's a tough one.
Can Electromagnetic radiation travel through a vacuum at a constant speed regardless of wavelength?
Yes. That is why we see light from distant stars, and use radio telescopes to see even older (more distant) structures. It might be easier to imagine light has having particle properties and wave properties both. Light arrives in discrete packets of energy (particles), yet can be "guided" and "directed" like waves.
What kind of waves do not need a medium to travel through?
Light. electromagnetic waves. **but be careful. Light is also a particle AND a wave. The light particle is called a photon, and although it always travels at the same speed (the speed of light) it can have different wavelengths. This is why we still see light from the Sun and stars. There is no medium in space, but since light does not need a medium to travel through, light can be observed still from great distances in the universe.
How is looking up at the night sky considered time travel?
The light you see are from stars long dead and so when you look into the night you see back into the time when these stars shone brightly . It took light-years for this light to reach across time and space to be seen by your eyes .
