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bilal99uzzzz
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Nothing can exceed the speed of light so how can scientists can tell us about 1000s of light years away of our location in the universe ? I mean what instruments have they used for it ? Waves? ( what kind of waves ? ).
bilal99uzzzz said:thanks
Drakkith
your answer was satisfying . as this universe has been around for
13.82 billion years so we must have the farthest stars and galaxies even farther than 13 billion light years because the universe is expanding now what is farthest place or star or galaxy known to us and how far is that ? it's obvious that no
boundary is determined for the universe to have .
Not quite. The expansion muddles things. The light from the stuff that's furthest took about 13.8 billion years to reach us. But that light was emitted from matter that was, at the time, about 42 million light years away. Today, that matter is about 46 billion light years away.Shafat Hasan said:The beginning of the universe, 13.8 billion years was found by the redshift that galaxies emit. This redshift indicates that the universe is expanding and based on this expansion rate, distance and with Hubble's Constant, we found the age of the universe. Simply stating, the redshift was what allowed us to find the age, not light's travel through the universe. We didn't find the age by seeing how far light traveled but by redshift. As far as my understanding goes.
As Chalnoth says, the observable universe has a radius of 46 billion light years.Xyooj said:very confused now, so how big is the universe now in 2015 Earth year?
The most common method used by scientists to measure the universe is through the use of telescopes. Astronomers use telescopes to collect and analyze light from objects in space, which can provide information about their distance, size, and composition.
Scientists use a variety of techniques to determine the distance of objects in the universe. These include parallax measurements, which use the shift in an object's position when viewed from different angles, as well as standard candles, which use the known brightness of certain objects to estimate their distance.
Redshift is a phenomenon in which light from distant objects appears to be shifted towards the red end of the spectrum. This is caused by the expansion of the universe and can be used to measure the distance of objects. The greater the redshift, the farther away the object is.
The size of the universe is constantly expanding, making it difficult to determine its exact size. Scientists use the observable universe, which is the portion of the universe that we can see, as a reference point. They also use mathematical models and data from telescopes to estimate the size of the universe.
Yes, scientists have been able to estimate the age of the universe to be about 13.8 billion years old. This is done by measuring the cosmic microwave background radiation, which is leftover energy from the Big Bang, and by studying the evolution of stars and galaxies.