To determine the fate of our Universe we look back in time and measure the average distance between galaxies. What do we find? How does this result lead to the hypothesis of dark energy?
2007-03-19 23:54:13 · 2 answers · asked by aznbabyicecube 1 in Science & Mathematics ➔ Astronomy & Space
see according to d big bang theory the universe is expanding and d galaxies r movin away frm one another.......by measuring the distances v can determine the rate of expansion of d universe..........may be by dark energy u mean the energy produced durin the big bang that led to the galaxies move apart.......this merely contradicts the theory of steady state by some scientists who believed that universe is steady............may be this is d best ans
2007-03-20 00:02:10 · answer #1 · answered by ashwin parihar 2 · 0⤊ 0⤋
The thing we really measure is the speed of objects farther and farther away. The farther away the object the greater the time that it has taken for the light/radoiwaves to reach us. In this way the observations we make are of what the object was doing some time in the past. One light year means that the observation we are making is what the object was like one year ago. The farthest observations are billions of lightyears away. That means we are looking back into the past billions of years. Everything is moving apart. We know this because the farther into the past we look the faster things are going away from us. The change in speed over time is different than is explained by the gravitational attraction of the matter we have been able to discover. WIkipedia has an entry on dark energy.
2007-03-21 22:37:49 · answer #2 · answered by anonimous 6 · 0⤊ 0⤋