What are the three possible outcomes for the 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.
What do astronomers mean when we say a galaxy is redshifted?
Ever since 1929, when Edwin Hubble discovered that the Universe is expanding, we have known that most other galaxies are moving away from us. Light from these galaxies is shifted to longer (and this means redder) wavelengths – in other words, it is ‘red-shifted’.
Why is most of the galaxy redshifted?
The galaxies are moving away from Earth because the fabric of space itself is expanding. While galaxies themselves are on the move — the Andromeda Galaxy and the Milky Way, for example, are on a collision course — there is an overall phenomenon of redshift happening as the universe gets bigger.
What else makes up the universe?
Composition. The universe is composed almost completely of dark energy, dark matter, and ordinary matter. Other contents are electromagnetic radiation (estimated to constitute from 0.005% to close to 0.01% of the total mass-energy of the universe) and antimatter.
What is red-shift NASA?
Redshift, displacement of the spectrum of an astronomical object toward longer (red) wavelengths. It is attributed to the Doppler effect, a change in wavelength that results when a given source of waves (e.g., light or radio waves) and an observer are in motion with respect to each other. Doppler shift. Doppler shift.
What does red shift prove?
Evidence from red-shift Astronomers have discovered that, in general, the further away a galaxy is, the more red-shifted its light is. This means that the further away the galaxies are, the faster they are moving. Red-shift data provides evidence that the Universe, including space itself, is expanding.
What is a blue shift?
A blueshift is any decrease in wavelength (increase in energy), with a corresponding increase in frequency, of an electromagnetic wave; the opposite effect is referred to as redshift. In visible light, this shifts the color from the red end of the spectrum to the blue end.
What is red shift GCSE?
Astronomers can observe light from distant galaxies . The dark lines in the spectra from distant galaxies show an increase in wavelength. The lines are moved or shifted towards the red end of the spectrum. This effect is called red-shift . The diagram shows part of the emission spectrum of light from a distant galaxy.
What is the Doppler effect GCSE?
The Doppler effect is the change only in the observed frequency of a source which is stationary relative to an observer. Both the frequency and the wavelength change when a source is moving relative to an observer. You can hear this effect yourself by listening carefully to traffic going past on a main road.
Why do galaxies appear red?
The various colors in a galaxy (red bulge, blue disks) is due to the types of stars found in those galaxy regions, called its stellar population. Big, massive stars burn their hydrogen fuel, by thermonuclear fusion, extremely fast.
What are the colors for Galaxy?
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Why do astronomers often call elliptical galaxies red and dead?
Giants of the Universe: Elliptical Galaxies The violent star formation can exhaust most of the gas in one go. Thus, only the old stars are left, and since old stars are red-orange, this is the color of most elliptical galaxies. Hence, this so-called quenching leaves behind a red and ‘dead’ galaxy.
Do elliptical galaxies have dark matter?
1 keV gaseous halos extending, in some cases, to well beyond 10re is strong evidence for the presence of extended dark matter in elliptical galaxies.
What is the most beautiful galaxy?
NGC 2336 is the quintessential galaxy — big, beautiful, and blue — and it is captured here by the NASA/ESA Hubble Space Telescope.
Why do elliptical galaxies appear red?
Furthermore, there is very little interstellar matter (neither gas nor dust), which results in low rates of star formation, few open star clusters, and few young stars; rather elliptical galaxies are dominated by old stellar populations, giving them red colors.
What color is an irregular galaxy?
bluer
Why are the spiral galaxies bluer than the elliptical galaxies?
So the answer to your question is: The reason spiral galaxies are not red is that they keep forming new stars, the most luminous of which are blue. And the reason elliptical galaxies are not blue is that they’re unable to form new stars, so only the red ones are left.
Why does an elliptical galaxy look like one giant star?
An elliptical galaxy looks as if it is a giant star because it lacks the distinctive structure of a spiral galaxy, where the bulge is surrounded by a…
What is the major difference between an elliptical galaxy and a spiral galaxy?
Spiral galaxies contain both old and young stars, as well as interstellar matter, and have typical masses in the range of 109 to 1012MSun. Our own Galaxy is a large spiral. Ellipticals are spheroidal or slightly elongated systems that consist almost entirely of old stars, with very little interstellar matter.
What is the major difference between an elliptical galaxy an irregular and a spiral galaxy quizlet?
The major difference between spiral and elliptical galaxies is that elliptical galaxies lack a significant disk component, although both types have the halo component. You just studied 32 terms!
Which type of galaxy is largest?
giant ellipticals
Is the Milky Way a spiral or barred spiral galaxy?
The Milky Way is a large barred spiral galaxy. All the stars we see in the night sky are in our own Milky Way Galaxy.