How can you see 13 billion light years?
Also in 2004, a team using both the Hubble Space Telescope and the Keck Observatory discovered a galaxy that is believed to be about 13 billion years away from us. It was found when observing the galaxy cluster Abell 2218. The light from the distant galaxy was visible because of gravitational lensing.
How do we know that the age of the visible universe is 13.8 billion years?
The scientists studied an image of the oldest light in the universe to confirm its age of 13.8 billion years. This light, the “afterglow” of the Big Bang, is known as the cosmic microwave background and marks a time 380,000 years after the universe’s birth when protons and electrons joined to form the first atoms.
Is it possible to see a galaxy 20 billion light years away Why or why not?
Could we see a galaxy that is 20 billion light-years away? (Assume that we mean a “lookback time” of 20 billion years.) No, because it would be beyond the bounds of our observable universe. Galaxies recycle material from one generation of stars to the next, and without this recycling we could not exist.
Why can we only see 15 billion light years?
The visible universe appears to have a radius of 15 billion light years simply because the universe is about 15 billion years old. The light from more distant objects simply has not had time to reach us. For this reason everybody in the universe will find themselves at the middle of their own visible universe.
How far can we see back in time?
The most distant object in the Universe Located in Ursa Major, GN-z11 is a young galaxy barely 1/25th the size of our own, and it is so far away that when its faint light is observed by astronomers they are looking back in time more than 13 billion years, to just 400 million years after the Big Bang.
How long will the universe live?
It is expected that between 1011 (100 billion) and 1012 (1 trillion) years from now, their orbits will decay and the entire Local Group will merge into one large galaxy.
Where does space start and end?
Earth ends and outer space starts at the Kármán line, some 62 miles (100 kilometers) above the planet’s surface.
At what height is space?
100 kilometers