From the furthest reaches of space to Earth's cosmic backyard, a countdown of the discoveries that changed everything humanity knows about the universe. <br /><br />Thanks for watching. Follow for more videos. <br />#cosmosspacescience <br />#cosmology <br />#astronomy <br />#spacetime <br />#space <br />#NASA <br />#howtheuniverseworks <br />#season5 <br />#episode1 <br />#mostamazingdiscoveries <br />#ouruniverse <br />#universe <br /><br />
