ASTRON 2B03 Lecture Notes - Globular Cluster, Parsec, Hubble Deep Field
25 Sep 2013
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1 weakness of previous definitions -> they apply only to our solar system; we may want one that applies to our solar systems. Bbc news distant world has rocky surface". Up until this point, other plants we considered only to be gas. Rare discovery to have another rocky found right distance from star -> may be able to harbour life. Cbc news planet with 2 suns discovered. Binary system planet orbits 2 stars. Those 2 discoveries are recent last week. Most (over 99%) mass in our solar system is from our sun. Midlife star : nuclear burning in its core. In a few billion years, the sun will be so hot that it will burn away life on earth. 200 million years to go around the milky way orbit it. Au astronomical unit distance (diameter) between sun and earth. Sun as a red giant will have a diameter of 2 au, therefore earth will be fucked.
