Posted by art on December 05, 1997 at 08:18:47:
In Reply to: Chp. 15 posted by Elcie on December 04, 1997 at 22:22:10:
: Approximately how many times has the solar system orbited
: the center of the Galaxy since the Sun and planets were
: formed?
: Why is the Milky Way far more prominent in July than
: in December?
Period of Sun is about 250 Myr and solar system is 4.5 Byrs old, so about 18 times.
In summer we are looking inwards towards the inner spiral arm, in winter outwards towards the outer arm.
Things are brighter towards the center.
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