Hubblecast Video Explains How Hubble “Looks Back in Time”

October 3, 2013


This seven minute Hubblecast video helps explain how Hubble “looks back in time” to see the Universe as it was billions of years ago.

Hubblecast 68: The Hubble time machine
For episode 68 of the Hubblecast, Hubble transforms into more than just a telescope — it becomes a time machine! How can Hubble “look back in time” to see the Universe as it was billions of years ago? Dr. J explores the vast scale of our Universe, explaining how Hubble can be used to grasp cosmic distances, view very distant galaxies, and even explore our own past.

Source: Hubble Space Telescope

Credit: ESA/Hubble

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6 Responses to “Hubblecast Video Explains How Hubble “Looks Back in Time””

  1. jose zeledon Says:

    So if all the information we have from the universe is based of how it looked in the past, billions of years in the past, how the hell can we tell that its expansion is accelerating when we don’t actually know what the universe is doing RIGHT NOW? All we know is what it was doing billions of years ago! Get your story straight cosmologist, you are not making any sense.


  2. David Says:

    This expansion of the universe has been studied for numerous years and even a small measurement of acceleration over that period is enough indication that it exists. Mr hubble was the man who brought our attention to the notion of expansion since the big bang theory and now they are determining its accuracy and speed. Objects accelerating at any rate without any force to stop them like friction will have to reach maximum speed before any negative direction in speed would be to happen. It would be nice if enough funds were available so that everyone could participate in these types of scientific activities. Do some research today and you could easily become one of the world foremost experts in 20-30 yrs time given your excelerated rate of learning compared to a caveman. Ofcouse you won’t get funding but still your knowledge and experience will be equally as important. Documentation is important should you discover anything yourself.


  3. David Says:

    I have a theory that says that we could look back at the earths history like looking in a mirror. Should there be a planet or object that reflects light back in this direction which all objects do. We should in theory be able to see all light that has left the earth as it bounced of its surface. The light reflects of the surface of the earth and then it reflects back in this direction from object millions of light years away. These are of course microscopic light measurements but the do exist. These light waves will be expanding so infrared light like james web or beyond might be needed but light will just keep on reflecting around the universe until it dissipates and loses all energy like in your house or unit. This could be used to look back through the history of the earth just like looking in a mirror which is just light reflecting of silver. To see through the clouds on the surface would require the same technology they are using to see through the universes dust and gas. I we can find planets by the light they are reflecting and so on this means it could be possible.


  4. Rangutan Says:

    Scientists ASSUME that the speed of light is constant. It is NOT. We have a constant only for calculations in and around our galaxy. What is misinterpreted as frequency, light is a series of photons travelling at varoius intervals. Also, time is constant. There is no such thing as time-space. RRG2013


  5. Lita Says:

    As a creator of a video, you have an obligation to make sure the captions are correct. You Tube provides automatic captions but the speech recognition software is not very good and the captions are unclear. Go to to look for the link that tells you how you can edit the captions. Please do this for your viewers who rely on captions. Thanks.


  6. Roger Says:

    The problem with science is that they do a lot of assuming and then the next day they say they have found new data when the fact is they didn’t know what they were talking about in the first place. Sure they are looking back in time because of the distance/time of light, but they have absolutely no idea how long that is. Science has yet to explain why the expansion of the universe is speeding up rather than slowing down or why the second law of thermodynamics is false. If you want any valid information that science has acquired, you had better come back to Earth and go to the lab because 99.99999% of everything else they say is wrong.


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