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all galaxies are constantly moving away from each other and are increasing in speed due to the lessening effect of gravity over the distances between galaxies and the theoretical dark energy which scientists have yet to prove the existance of
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∙ 11y ago
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How is the universe changing by red shift?
the universe is changing by red shift because when red shift occurs it means that galaxies and stars are moving away from us. this means that the whole universe must be expanding.
How do astronomes determine the age of the universe?
This is deduced from the expansion of the Universe. Far-away galaxies recede (go away) from us, with such a speed, that they must have been near us about 14 billion years ago.
Did Edwin Hubble discover that galaxies are moving toward the earth?
Hubble discovered other galaxies than our own. His work lead to the idea that these galaxies are generally moving away from our own Milky Way. Further, logical thinkers considered that the universe itself is expanding. And if the universe is expanding, it must at some point have been "compressed" with all the matter closer together. This is the source of the idea we call the Big Bang.
What is the name of the biggest sat in the universe?
One of the biggest stars that we can observe and measure is Betelgeuse. This star is fairly close to us. No one can see even a tiny tiny bit's worth of the total universe, though, so in that sense, there can be no answer to your question. Remember . . . galaxies contain billions of stars and the universe must contain billions and trillion of galaxies, nearly all of which we cannot 'see'.
How many galaxies are there in all?
Astronomers now estimate that the observable universe contains anywhere between 100 and 300 billion galaxies. However, if spacetime is flat on large scales (as it seems to be), the universe is infinite in size and contains an infinite number of galaxies in total - they are just so far away that there light has not had time to reach us since the beginning of the universe. In fact, because the universe is expanding, we will never see most of these galaxies ever!billionsThe answer to your question is unknown. The universe is infinite containing billions and billions of galaxies as it expands.
Is the word universe capitalized?
it depends on the usage of the word. If you mean the collection of stars, galaxies, etc. then it is capitalized; The Universe. If you are talking about a group then it is not. Like "the entire universe of ant colonies..."
How is it possible that the universe could have existed for an infinite amount of time in the same state if galaxies are continously receding from each other?
It can't, at least one of those two suppositions must be false; possibly both.
How can scientists not be certain about how old the universe is?
The difficulty is in estimating the distance to the furthest galaxies. Before the discovery that nearly all galaxies beyond the Local Group were moving away from us (by analyzing the red shift in their spectra) it was assumed the Universe was ageless. However, by determining that the furthest galaxies were moving fastest away from us, Astronomers extrapolated backwards to arrive at the presently estimated time period - 13.7 billion years (when everything would have started in one spot). However, calculating the actual distance to other galaxies is very difficult. For nearer galaxies, stars known as Cepheid Variables (whose absolute brightness is directly correlated to their period of variability) can be used to accurately estimate the distance to those galaxies. However, Astronomers must rely upon less well understood phenomena to calculate distances, and without that precise measuring stick, the exact age of the Universe cannot be determined.
Do all galaxies outside local group have red shifts?
Yes. Also, the size of the red-shift for all distant galaxies is directly proportional to their distance from us. This means that the space between us and all distant galaxies is expanding. Thus, Einstein's (initial) view that our Universe has been eternally stable in the location of matter must be false. No surprise that he referred to his early view as his "greatest blunder."
What is one way that an elliptical galaxies differs from the other types of galaxies?
The answer you seek is within you must find it yourself to understand
Why the red shift in light from distant galaxies indicate that the universe is expanding?
Red shift is observed in the spectrum of light from an object when it is moving away from the observer. Most astronomical objects display a red shift in their light. Also, the red shift is greater for objects which are further away. For this to happen - in all directions, the universe must be expanding.
How did Edwin hubble determine that the universe must be expanding?
The red shift. A Doppler effect (used in speed trap radar) showing that all (except for a few close ones) galaxies are moving away from us - and the farther away they were the faster they were moving.
