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Today Phil’s explaining the stars and how they can be categorized using their spectra. Together with their distance, this provides a wealth of information about them including their luminosity, size, and temperature. The HR diagram plots stars’ luminosity versus temperature, and most stars fall along the main sequence, where they live most of their lives.
26 • Crash Course Astronomy • 2015 • Astronomy
We strip apart bizarre planets and strange moons and peel away impenetrable atmospheres, icy crusts and alien oceans layer by layer to reveal the secrets to extraterrestrial life.
5/6 • Strip the Cosmos • 2014 • 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
What would happen if we bring a sample (the size of a house) of the Sun to Earth?
In a Nutshell • 2017 • Astronomy
Impacts from space have created our planet and just about everything in it. Like celestial supply ships, they brought in water, metal, and maybe even life. They made our moon and sculpted the geography of our planet.
12/17 • Big History • 2013 • Astronomy
Science may soon make the dream of traveling to Mars a reality, but how will we live once we get there? How will we manage our basic human needs of food, water, and shelter on a planet known for its barren surface conditions, high radiation levels, and toxic dirt?
S1E3 • Becoming Martian • 2021 • Astronomy