ASTRON 2B03 Lecture Notes - Star Cluster, Length Contraction, Dwarf Planet
Document Summary
1 million earths could fit into sun. Neptune is last planet (beyond it is kuiper belt, icy objects) Has not cleared the neighborhood around its orbit. 99. 98% of the mass of our entire solar system. 4. 5 billion years old, shine for another 5 billion years. As sun grows older it gets brighter, and hotter, in a few billion years the sunn will be so hot it will burn away all life. Revolved around milky way galaxy every 235 million years. Like creating a triangle with the 6 months because distance to sun is the diameter of circle. We are measuring the movement of the star from january to july observations. Star moves left to right repeating compared to background stars. The larger the shift (more parallax effect) the closer the star. Megaparsecs (millions of lightyears) to describe distance between galaxies. Galaxies are about 80 000 light years across. Our own sun is 25 000 light years from center.
