the end of the era of nuclei
  • Which of the following cannot be true of the very first stars formed in the Universe?
  • Where do the photons in the cosmic background radiation originate?
  • Where does most star formation occur in the Milky Way today?
  • What is the most accurate way to determine the distance to a nearby galaxy?
a repulsive force that counteracts gravity and was introduced to allow for a static universe
  • What do scientists mean by the critical density of the universe?
  • What is Einstein's cosmological constant?
  • What is the evidence for an accelerating universe?
  • Why are Cepheid variables important?
hot gas erupting into intergalactic space from a large superbubble
  • What kinds of objects lie in the disk of our galaxy?
  • What is a galactic wind?
  • What is the evidence for an accelerating universe?
  • What is Einstein's cosmological constant?
about a hundred
  • Which of the following cannot be true of the very first stars formed in the Universe?
  • What is the most accurate way to determine the distance to a nearby galaxy?
  • Where does most star formation occur in the Milky Way today?
  • How many more stars does a starburst galaxy form, in one year, than the Milky Way?
they are very bright, so they can be used to determine the distances to galaxies billions of light-years away and they should all have approximately the same luminosity.
  • What kinds of objects lie in the disk of our galaxy?
  • What makes white-dwarf supernovae good standard candles?
  • What evidence suggests that the Milky Way contains dark matter?
  • What does the universe look like on very large scales?
the cosmic background radiation and the high helium content of the universe.
  • What are the two key observational facts that led to widespread acceptance of the Big Bang model?
  • What does the universe look like on very large scales?
  • Why is a dense cloud more likely to produce an elliptical galaxy than a spiral galaxy?
  • Which of the following cannot be true of the very first stars formed in the Universe?
Dr. X believes that the universe is older than Dr. Y believes
  • Dr. X believes that the Hubble constant is Ho=55km/s/Mpc. Dr. Y believes it is Ho=80km/s/Mpc.
  • What are the two key observational facts that led to widespread acceptance of the Big Bang model?
  • Harlow Shapley concluded that the Sun was not in the center of the Milky Way Galaxy by?
  • Why is a dense cloud more likely to produce an elliptical galaxy than a spiral galaxy?
mapping the distribution of globular clusters in the galaxy.
  • Which of the following cannot be true of the very first stars formed in the Universe?
  • What do scientists mean by the critical density of the universe?
  • Harlow Shapley concluded that the Sun was not in the center of the Milky Way Galaxy by?
  • Dr. X believes that the Hubble constant is Ho=55km/s/Mpc. Dr. Y believes it is Ho=80km/s/Mpc.
in the spiral arms.
  • Where do the photons in the cosmic background radiation originate?
  • What does the universe look like on very large scales?
  • Where does most star formation occur in the Milky Way today?
  • What is the most accurate way to determine the distance to a nearby galaxy?
White-dwarf supernovae are slightly dimmer than expected for a coasting universe.
  • What is the evidence for an accelerating universe?
  • What is Einstein's cosmological constant?
  • What does the universe look like on very large scales?
  • What kinds of objects lie in the disk of our galaxy?
Why is the sky dark at night?
  • Olbers' paradox is an apparently simple question, but its resolution suggests that the universe is finite in age. What is the question?
  • Where do the photons in the cosmic background radiation originate?
  • Which of the following cannot be true of the very first stars formed in the Universe?
  • Harlow Shapley concluded that the Sun was not in the center of the Milky Way Galaxy by?
they may have had rocky planets around them
  • What are the two key observational facts that led to widespread acceptance of the Big Bang model?
  • Where do the photons in the cosmic background radiation originate?
  • What is the most accurate way to determine the distance to a nearby galaxy?
  • Which of the following cannot be true of the very first stars formed in the Universe?
directly related to their true luminosities. hence, we can use cepheids as "standard candles" for distance measurements.
  • Why are Cepheid variables important?
  • What is Einstein's cosmological constant?
  • Why did the era of nuclei end when the univers was about 300,000 years old?
  • Why is a dense cloud more likely to produce an elliptical galaxy than a spiral galaxy?
old, red, and dim and have fewer heavy elements
  • What does the universe look like on very large scales?
  • Compared with our Sun, most stars in the halo are?
  • Which of the following cannot be true of the very first stars formed in the Universe?
  • What kinds of objects lie in the disk of our galaxy?
The motions of the gas and stars at the center indicate that it contains a million solar masses within a region only about 1 parsec across
  • What evidence supports the theory that there is a black hole at the center of our galaxy?
  • What evidence suggests that the Milky Way contains dark matter?
  • Why do we believe 90 percent of the mass of the Milky Way is in the form of dark matter?
  • Why is a dense cloud more likely to produce an elliptical galaxy than a spiral galaxy?
the orbital speeds of stars far from the galactic center are surprisingly high, suggesting that these stars are feeling gravitational effects from unseen matter in the halo.
  • Why isn't space expanding within systems such as our solar system or the milky way?
  • Why is a dense cloud more likely to produce an elliptical galaxy than a spiral galaxy?
  • Why do we believe 90 percent of the mass of the Milky Way is in the form of dark matter?
  • Why did the era of nuclei end when the univers was about 300,000 years old?
two, gravity and the GUT force
  • Where does most star formation occur in the Milky Way today?
  • Why isn't space expanding within systems such as our solar system or the milky way?
  • How many forces operated in the universe during the GUT era?
  • How many more stars does a starburst galaxy form, in one year, than the Milky Way?
we do not yet have a theory that links quantum mechanics and general relativity.
  • Why can't current theories describe what happened during the Planck era?
  • Why isn't space expanding within systems such as our solar system or the milky way?
  • Why did the era of nuclei end when the univers was about 300,000 years old?
  • I observe a galaxy that is 100 million light-years away: what do i see?
the higher gas density forms stars more efficiently, so all the gas is converted into stars before a disk can form
  • Why did the era of nuclei end when the univers was about 300,000 years old?
  • Why is a dense cloud more likely to produce an elliptical galaxy than a spiral galaxy?
  • Why do we believe 90 percent of the mass of the Milky Way is in the form of dark matter?
  • Why isn't space expanding within systems such as our solar system or the milky way?
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