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Sagan discusses comets and asteroids as planetary impactors, giving recent examples of the Tunguska event and a lunar impact described by Canterbury monks in 1178. It moves to a description of the environment of Venus, from the previous fantastic theories of people such as Immanuel Velikovsky to the information gained by the Venera landers and its implications for Earth's greenhouse effect. The Cosmos Update highlights the connection to global warming.
4/13 • Cosmos: A Personal Voyage • 1980 • Astronomy
How do astronomers make sense out of the vastness of space? How do they study things so far away? Today Phil talks about distances, going back to early astronomy. Ancient Greeks were able to find the size of the Earth, and from that the distance to and the sizes of the Moon and Sun. Once the Earth/Sun distance was found, parallax was used to find the distance to nearby stars, and that was bootstrapped using brightness to determine the distances to much farther stars.
25 • Crash Course Astronomy • 2015 • Astronomy
Today on Crash Course Astronomy, Phil invites you to head outside and take a look at all the incredible things you can see with your naked eye.
#2 • Crash Course Astronomy • Astronomy
Today on Crash Course Astronomy, Phil dives into some very dark matters. The stuff we can actually observe in the universe isn’t all there is. Galaxies and other large structures in the universe are created and shifted by a force we detect mostly indirectly, by observing its impact: DARK MATTER.
41 • Crash Course Astronomy • 2015 • Astronomy
Mars Perseverance Rover is in its final cruise stages preparing for its historic Feb 18 landing on the red planet. We take you inside the harrowing landing, the science mission, and cutting edge technology, including the first-ever Martian helicopter.
Breakthrough • 2021 • Astronomy
Thought experiment on what would happen if the Earth stopped spinning.