Some of the Invisible Matter in Our Galactic Halo Has

question 48

Multiple Choice

Some of the invisible matter in our Galactic halo has been shown to be white dwarfs by:

• A)direct detection with optical telescopes, such as the Hubble Space Telescope.
• B)direct detection with gamma-ray observations from the Fermi Telescope.
• C)observations of Type I supernovae.
• D)the gravitational microlensing technique.
• E)watching white dwarfs in the Galactic halo pass in front of distant galaxies.

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