Earth and the other seven planets in our solar system have only one star: the Sun. Years ago, astronomers found the first exoplanet that had two stars. They also found one with three stars. And four. Just how many stars can one planet...

Hank talks about astrobiology - the study of and search for life in the universe off Earth. Right now, the field has more questions than answers, but all they all seek to answer that one fundamental query: are we alone in the universe?

So you've made a movie. Congrats! But now you have to get people to see it. How you market your movie depends a lot on what your movie is. Is it a massive blockbuster? That means one set of requirements. Is it a small, Indy film? That's...

Finally, after what seems like eons and eons, the end is nigh. We're talking not only about the end of Crash Course Big History, but also the end of everything. The end of humanity and the end of the universe.John and Hank Green will...

Astronomer Jean-Luc Margot has come up with a new definition for planets that may help us categorize worlds outside of the solar system, and we may have also discovered a new dwarf planet within the solar system!

Hank talks about astrobiology - the study of and search for life in the universe off Earth. Right now, the field has more questions than answers, but all they all seek to answer that one fundamental query: are we alone in the universe?

Finally, after what seems like eons and eons, the end is nigh. We're talking not only about the end of Crash Course Big History, but also the end of everything. The end of humanity and the end of the universe.John and Hank Green will...

What does it really take for a planet to be habitable? It turns out, certain parts of a star system, a galaxy, and even the universe as we know it, are more habitable than others. Get to know them as Hank takes you on a tour of some of...

Sci-Fi worlds may have giant worms or twin suns, but those are pretty cozy compared to these wild worlds.

Earth has received its first speedy visitor from another star system, A/2017 U1, and the Dawn Mission has helped astronomers gather more evidence about possible former oceans on Ceres.

What was once thought to be a black hole might in fact be a star that feeds on its own kind!

Learn more about gravitational lensing with host Caitlin Hofmeister.

Explore the physics of a double-star system: calculate the angular speed of two orbiting stars and determine the minimum escape speed a meteoroid needs to flee the gravitational pull from the center of mass.

Learn how astrophysicists use the orbital motion of a visible star—its speed and period—to infer the mass of its invisible companion, often a black hole, in a binary system.

Pupil outcome: I can evaluate the impact of the 'boom years' on prosperity in the USA. Key learning points: - Many people benefitted from the 'boom years'. - The benefits were not evenly shared out. - There was regional variation in...

Can planets exist in multi-star systems, and what would that look like from their perspective?

Let's learn about Kepler-16b!

A conversation with Jon Jenkins, the science lead for the Science Processing Operations Center at NASA's Ames Research Center in Silicon Valley. At the SPOC, the raw data from NASA’s newly launched planet hunter, TESS, is prepared for...

Scientists found a giant planet 325 light years away, but its very existence proves there’s something wrong with science.

Can planets exist in multi-star systems, and what would that look like from their perspective? Thanks to Blinkist for sponsoring today's video.