How do astronomers observing distant galaxies talk about looking backward in time?

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The speed of light is not infinite. Light takes time to travel from distant galaxies to our eyes here on Earth. If a galaxy is 1 billion light years away, it has taken 1 billion years for the light emitted by said galaxy to reach us here, so (obviously) we are seeing the light emitted 1 billion years ago. In a sense, we are seeing 1 billion years into the past at the light emitted by that galaxy.
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What is the most distant galaxy?

In all probability, one that is beyond the observable Universe. The furthest known galaxy is IOK-1, which formed about 750 million years after the big bang. It is, now, approximately 12.9 billion light years from us. Abell 1835 IR1916 was believed to be around 13.2 billion light years fro ( Full Answer )

Why do scientists study distant galaxies?

because . they want to look at a star one moment then go back and see if it moved or if the star is in the same place . that's mainly what the are searching for. to learn more about our galaxy.

How do distant galaxies usually move?

They move out from the center of the universe (where the big bang happened). ______________ However, we don't know where the Big Bang happened, so all we can really see is that all\\\\ MOST of the other galaxies are moving "away from us". There are a few, like Andromeda, that are actually movi ( Full Answer )

Why do distant galaxies look like stars?

Because they are so far away that the light is too dim and diffuse to make out individual stars or groups of stars. With a high-powered telescope, you can distinguish other galaxies from the closer objects in our own Milky Way galaxy, whose stars are all around us.

Why are astronomers actually looking into the past when they observe objects?

Objects studied by astronomers are so far away that it takes a significant time for their light to reach earth.. For example, even in the case of the sun, what you see in the sky is not what the sun looks like 'right now', but what the sun looked like about 8 minutes ago ... because that's how long ( Full Answer )

Why are you looking back in time when you see a distant star?

Because the star's light takes time to reach Earth. So, if the star's light suddenly changed, we would not see it until the time taken for ligh to travel from the star to Earth. The light is showing what happened in the past, or back in time.

Why do scientist study distant galaxies?

Because they want to know if there is another planet out there that we can live on. but God provided our planet and he loves us just as much!

Studying distant galaxies is described as looking back into the past What does this mean?

When we view an object in space, we are notobserving it "as is" we are observing it "as it was". What we are seeing, is the light that was emitted at that time. For example: A galaxy is 1,000,000 light years away. When we view it, we are seeing it as it was 1,000,000 years ago, because that is how ( Full Answer )

What are the names of the distant galaxies?

Most galaxies don't have names, they have catalogue numbers. Some do have names, such as the Andromeda galaxy, or the Greater and Lesser Magellanic Clouds.

Why looking at distant galaxies reveal what young galaxies look like?

Light has a finite and constant speed. It always takes time to travel from the object to our eyes. When we look out at the sun moon and stars we see into the past. We see the moon as it was 1.29 seconds ago. It takes light 1.29 seconds to travel the 384,000 km to the earth. It is 1.29 light secon ( Full Answer )

Reasons why astronomers have difficulty looking at distant stars except?

Light years of dust lanes obscure the view of distant stars invisible light. However, radio telescopes can penetrate the dust andcan detect (in the x-ray and infrared spectra) the stars in thecore of our galaxy. . They don't understand how redshift affects stars. .

Why do astronomers observe the galaxy at millimeter wavelength?

Millimeter wavelengths are short frequency radio waves astronomers use because they can see gases and other phenomena not visible in visible light. MM wavelengths are usually used where the air is dry so water vapor can't scatter the waves.

Explain why looking at distant galaxies give scientist an idea about how galaxies change over time?

There are many stars in each stage of development, so the obvious assumption is that they represent similar stars, with similar stages, except that they began their existence at different times. Imagine you knew nothing of people. You were then given millions of pictures of people in varying stat ( Full Answer )

How is observing distant astronomical objects like seeing back in time?

Picture this: You and your best friend are in constant communication, and your friend constantly informs you of every little thing that happens in her life. But the method of communication is "snail mail", which usually takes two or three days in transit. So, every time you read a line that sa ( Full Answer )

Can you see distant galaxies from earth?

No. You can only see other stars in the Milky Way. _________________________________________ Actually, there are some galaxies that are visible to the naked eye. In the southern hemisphere, the Greater and Lesser Magellanic Clouds, satellite galaxies of our own Milky Way, are perhaps the best e ( Full Answer )

How does the light that astronomers see from distant stars and galaxies tell htem that the same atoms with the same properties exist throughout the universe?

We determine the types of elements contained in the star or within the corona by analyzing the spectrum of the light we receive. Each element will radiate at a set of specific discreet frequencies, and the frequencies they radiate tell us what the element is, and how deeply ionized it is. The spectr ( Full Answer )

What can astronomers conclude based on the observed red shifts in the spectral lines of distant galaxies?

The strongest consensus (near unanimous of the astronomical community is that the redshifts of distant galaxies indicate that all distant galaxies are receding from us. This recession is currently the only known mechanism for redshifting light. Take this inference, that all galaxies are receding ( Full Answer )

Why do observations made of distant galaxies indicate that dark energy exists?

The observations made from distant galaxies suggest that Dark energy exists. This is because of the fact that the galaxies are moving away from each other. This is given by Hubbles law.Instead of being attracted by the force of gravitation,galaxies tends to move away suggesting the presence of a gr ( Full Answer )

How does the observation that light from distant stars and galaxies is redshifted support the theory of the big bang?

When we look at the light from other stars and examine the spectrum of their light, we can see dark "absorption lines" in the star's light. This helps us to determine what elements are in the star. Those lines are at VERY precise frequencies. When astronomers began measuring the spectrum of distant ( Full Answer )

How do astronomers find out about changes in galaxies over time?

Astronomers can watch galaxies that are far away. Since the lighttakes billions of years to reach us from the farthest knowngalaxies, they would be watching galaxies in the early Universe. Itturns out, from such observations, that the Universe is changing.

How do observations of distant galaxies tell us that the universe started with a big bang?

The discovery and mapping of the Cosmic Microwave Background Radiation (CMBR) via WMAP mission has been interpreted as being left over from the Big Bang. It provides support for the hypothesis of a hot dense state at the beginning and also provided measurements to explain that galactic clusters are ( Full Answer )

Why is it that when scientists look at very distant galaxies through powerful telescopes they see the galaxies as they were millions or billions of year ago?

Because that's how long it has taken the light from those galaxies to reach us. You don't 'see' something until the light from it reaches you. If the thing is on the moon, it takes about 1.27 seconds. It it's on the sun, it takes about 8 1 / 3 minutes. If it's on the nearest star outside our ( Full Answer )

How did 1920's astronomer Edwin Hubble explain his observations that all light from distant galaxies exhibits the red-shift Doppler effect?

He concluded that all of space was expanding. Answer2: Hubble did not conclude that all space was expanding! Hubble concluded that he did not know what the redshift was. 1. "Red shifts represent Doppler effects, physical recession of the nebulae, or the action of some hitherto unrecognized ( Full Answer )

Why astronomers have difficulty looking at distant stars except?

Astronomers have difficulty looking at distant stars because whilewe have highly specialized telescopes, they are in constantcontention with various other celestial bodies. In addition tothis, the light of distant stars takes hundreds of thousands ofyears to reach us, making it impossible to get a c ( Full Answer )

Where is the distant galaxy?

There are distant galaxies all around us - in all directions, and at varying distances.

Why When scientists look at the very distant galaxies through powerful telescopes they see the galaxies as they were millions or billions of years ago?

Because light takes time to travel. Light travels at approximately300,000km/second. The Sun is about 150 million km away from Earth. Light takes 8minutes to reach us from the Sun.. But for a galaxy 1 million lightyears away, the light takes 1 million years to reach us. So when itfinally gets here, i ( Full Answer )