Why does the value of Hubble's constant alone not tell us the fate of the universe?
What will be an ideal response?
Hubble's constant tells us how fast the universe is expanding today but the fate of the universe (whether it will expand forever or whether the expansion will eventually reverse) depends also on the gravitational pull of all the matter in the universe. Thus to learn about the fate of the universe we must measure not only how fast it is expanding but also how much matter it contains. Hubble's constant changes over time.
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A lunar eclipse can only happen during a
A) new Moon. B) equinox. C) full Moon. D) perigee. E) aphelion.
The first clue to the significance of quasars came from the discovery that some of these "stars" were much stronger radio sources than any normal star
Indicate whether the statement is true or false
During which phase of the Moon can a lunar eclipse occur? During which phase can a solar eclipse occur?
All ____ galaxies are spiral galaxies that have small luminous nuclei
a. active b. radio c. Seyfert d. double-lobed radio e. blazar