What is a expanding universe theory?
noun. the theory, developed from the observed red shifts of celestial bodies, that the space between galaxies is expanding, so that they appear to recede from us at velocities that increase with their distanceSee also oscillating universe theory.
How does the theory support an expanding universe?
The theory of relativity predicts phenomena associated with the expansion, notably the redshift-versus-distance relationship known as Hubble’s Law; functional forms for cosmological distance measurements that differ from what would be expected if space were not expanding; and an observable change in the matter and …
What was Hubble’s expanding universe theory?
Hubble’s brilliant observation was that the red shift of galaxies was directly proportional to the distance of the galaxy from earth. That meant that things farther away from Earth were moving away faster. In other words, the universe must be expanding. He announced his finding in 1929.
Did Einstein believe the universe is expanding?
Albert Einstein accepted the modern cosmological view that the universe is expanding long after many of his contemporaries. Until 1931, physicist Albert Einstein believed that the universe was static.
Why does the universe expand?
Universe Dark Energy-1 Expanding Universe Astronomers theorize that the faster expansion rate is due to a mysterious, dark force that is pulling galaxies apart. One explanation for dark energy is that it is a property of space.
What are the three possible outcomes of an expanding universe?
The three possible outcomes include: an open universe, in which the expansion will never stop; a closed universe, in which the expansion will stop and turn into a contraction; and a flat universe, in which the expansion will slow to a halt in time—but it will never contract.
Who first discovered the Universe is expanding?
astronomer Edwin Hubble
American astronomer Edwin Hubble and others discovered in the 1920s that the Universe is expanding by showing that most galaxies are receding from the Milky Way — and the farther away they are, the faster they are receding. The roughly constant ratio between speed and distance became known as the Hubble constant.
Is the Milky Way expanding?
The Milky Way, the galaxy which contains our own solar system, is expanding and will eventually grow into its neighbour, Andromeda. Already 100,000 light years in diameter, new research puts its rate of growth at about 500 metres per second.