Documents Szydagis04.13.2015 1 / 14 NASA/STEREO/SDO/GSFC 1. How do we know that the sun is a star (and...

Slide 1 Slide 2 Szydagis04.13.2015 1 / 14 NASA/STEREO/SDO/GSFC Slide 3   1. How do we know that the sun is a star (and bonus: when and how did we learn this in history?…

Documents Chapter 16 The Milky Way Galaxy 16.1 Overview n How many stars are in the Milky Way? – About 200.....

Chapter 16 The Milky Way Galaxy 16.1 Overview How many stars are in the Milky Way? About 200 billion How many galaxies are there? billions and billions How old is the Milky…