Recent content by caitybear

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    Astronomy question - help!!?

    The Sun orbits around the Galaxy at a radius of about 8.5 kpc. In a mere 110 million years from now, the Sun will be on the other side of the Galaxy. The nearby galaxies will appear to shift in the sky relative to more distant background galaxies - a galactic parallax. What would be the number...
  2. C

    Astronomy - please help?

    Consider a Cepheid variable with a period of ten days, a mean radius of about 100(Solar radii), and a radial velocity averaging 15 km/s. What is the change in its radius? DeltaR = R(1)-R(2)?
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