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What two quantities did Edwin Hubble compare to discover the expansion of the Universe?
Edwin Hubble compared the distances to galaxies (based on their brightness) and their redshifts (due to the Doppler effect) to discover the expansion of the Universe. By finding a relationship between these two quantities (dubbed Hubble's Law), he provided evidence that the Universe is expanding.
How do the distances between inner planets compare to the distances between the outer planets?
The distances between the inner planets is smaller than the distances between the outer planets.
How does the energy of the cosmic microwave background compare to the energy radiated by all the stars and galaxies that ever existed?
The energy of the cosmic microwave background is about 400,000 times less than the energy of all the stars and galaxies that ever existed. The CMB is the remnant radiation from the early universe, while the energy radiated by stars and galaxies have been accumulating over millions of years.
How does the distance between planet earth and the sun compare with the distances between the planet earth and other stars?
The Sun is many thousands of times closer to Earth than any other star.
Why is light year used to measure the of stars?
No because the wavelength is determined by the star radiating the light. But over large distances from far-off galaxies there is a slight shift in the wavelength called the red shift, and the distance can be measured by the amount of red shift.
What two quantities did Edwin Hubble compare to discover the expansion of the Universe?
Edwin Hubble compared the distances to galaxies (based on their brightness) and their redshifts (due to the Doppler effect) to discover the expansion of the Universe. By finding a relationship between these two quantities (dubbed Hubble's Law), he provided evidence that the Universe is expanding.
How do the distances between inner planets compare to the distances between the outer planets?
The distances between the inner planets is smaller than the distances between the outer planets.
How does distance between earth and sun compare to distance between earth and nearby stars and galaxies?
We measure distances between celestial objects (such as suns, planets, and galaxies) by a unit of measurement called "AU" which stands for, Astronomical Unit. One AU is the equivalent to 93 million miles, which is roughly the distance from earth to the sun. Let's compare that to the next closest star to us, Alpha Centauri, which is 4.4 light years away, or about 271,930 AUs! Distances are Immense.
What evidence can you cite that the universe is flat How does that compare to previous beliefs about the universe?
The universe isn't flat. It is 3-Dimensional time and space. Galaxies are depicted as being donut shaped and flat
How do you best compare the amount of empty space in the universe to the amount of space galaxies occupy?
The amount of empty space in the Universe, between galaxies, is many times larger than the amount of space occupied by galaxies. This ratio depends on what part of the Universe you are looking at. For example, our galaxy has a diameter of about 100,000 light-years; the closest larger galaxy (M31) is at a distance of about 2.5 million light-years. However, that's just the Local Group; from the Local Group to another galaxy cluster, there is even more empty space.
How do the distances between the inner planets compare?
The distances between inner planets are relatively close compared to the distances between outer planets. For example, the distance between Earth and Venus is around 25 million miles on average, while the distance between Earth and Mars can vary from 34 million to 250 million miles due to their elliptical orbits.
How will you compare the distances between dots?
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How do the distances between inner planets compare to distances between the outer planets?
The distances between inner planets (Mercury, Venus, Earth, Mars) are much smaller compared to the distances between outer planets (Jupiter, Saturn, Uranus, Neptune). The inner planets are closer to each other, with relatively small gaps between their orbits, while the outer planets are much farther apart, with larger gaps between their orbits.
How do the speeds at which most nearby galaxies are moving away from the earth compare to the speeds of distant galaxies that are moving away from earth?
Distant galaxies are moving away from Earth at faster speeds compared to nearby galaxies. This is due to the expansion of the universe, where galaxies farther away experience a greater redshift, indicating faster recession velocities. This relationship is described by Hubble's Law, which states that the recessional velocity of a galaxy is directly proportional to its distance from us.
How does the energy of the cosmic microwave background compare to the energy radiated by all the stars and galaxies that ever existed?
The energy of the cosmic microwave background is about 400,000 times less than the energy of all the stars and galaxies that ever existed. The CMB is the remnant radiation from the early universe, while the energy radiated by stars and galaxies have been accumulating over millions of years.
How can asronomers infer approximately how long the universe has been expanding?
As a first approximation, they compare the current speed of expansion, with the distance between the expanding objects. The expansion is at a speed which, extrapolated backward, would place all galaxies very close together at a time that is ca. 14 billion years in the past.
Is it possible to compare two distances in geometry?
Yes, you can compare two distances in geometry. Here are some ways to do it: http://www.regentsprep.org/regents/math/geometry/gcg3/ldistance.htm
