We Don't Planet

Learn all about pulsars — neutron stars that seem to blink on and off superfast — in the 16th episode of the astrophysics-explainer video series "We Don't Planet."

Learn all about neutrinos — ghostly, chargeless particles that hardly ever interact with normal matter — in the 14th episode of the astrophysics-explainer video series "We Don't Planet."

Learn all about the parsec, one of the most commonly used distance measurements in astronomy, in the 10th episode of the astrophysics-video series "We Don't Planet."

Astronomers use a variety of methods to determine how far away celestial objects are from Earth. Learn about this "cosmic distance ladder" in the ninth episode of "We Don't Planet."

Planets and other celestial bodies can take many types of paths through space. Learn all about the different kinds of orbits in the sixth episode of "We Don't Planet."

The Hertzsprung-Russell diagram allows astronomers to map out the complete life history of a star. Learn all about this famous diagram in the fifth episode of "We Don't Planet."

Dark matter is far more abundant in the universe than the "normal" stuff we can see and touch. Learn about the evidence for dark matter in the fourth episode of "We Don't Planet."

A massive cosmic object can act like a lens, magnifying and warping the images of background bodies. Learn all about this "gravitational lensing" phenomenon in the third episode of "We Don't Planet."

Dark energy is the mysterious force causing the universe's accelerating expansion. Learn all about it in the second episode of the astrophysics video-explainer series "We Don't Planet."

There's a new way to get your astrophysics fix: "We Don't Planet," a new series of 4- to 6-minute videos that explores some of the most fascinating concepts and objects in the cosmos.

Learn all about the structure of the sun in the first episode of the astrophysics video-explainer series "We Don't Planet."