ica3-aug31 - see the whole Galaxy we're clearly off to the...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Class 4, ICA #3, August 31. We had 2 clicker questions based on the "Powers of Ten" short. Clicker Question #1: (Pick the correct statement.) E. Once we see the whole Milky Way, the Sun is an invisible speck. Why: A can't be right because you have to have moved many lightyears before the stars start to move. B can't be right because when we see the whole Solar System, the planets themselves are just invisible specks. C can't be right because when we zoom-out to
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: see the whole Galaxy, we're clearly off to the side. D can't be right since the Solar System is just a few tens of AU wide but the whole Milky Way is 100,000 ly, many steps bigger. Clicker Question #2: The zoom-out stops at about 100 million light years because B. that's how far we could see with 1970s technology. Why: Recall that the Observable Universe extends about 14 billion light-years away from us....
View Full Document

Ask a homework question - tutors are online