Transcript Size & Distance Comparison (Powerpoint)
A typical galaxy will contain around 100 billion stars. We estimate that there are around 100 billion galaxies in the Universe Light travels at 300,000km/s……. Light travels from the Moon to the Earthfrom in just a second ……so theover Moon to the Earth in just over a second From the Sun light takes around 8 minutes to reach Earth and around 4 hours to reach Neptune Light travels from the Moon to Light takes just over 4 years to the Earth in just over a second reach us from the next star Most of the stars we see at night are 10-1000 light years distant Light takes 2.2 million years to reach us from the Andromeda Galaxy Astronomers can now detect galaxies over 12.8 billion light years away. The light left these galaxies not long after the Big Bang formation of the Universe around 13.6 billion years ago. So we can almost see back to the beginning of time itself.