17:43
New Horizons Prepares for Pluto Close-Up
The New Horizons probe is about to capture its prize: a close-up of Pluto.
5:14
Astronomers Play Hide-and-Seek with Supermassive Black Holes
Researchers estimate that there are millions of supermassive black holes hidden in the universe.
A Peek Inside the Mind of Elon Musk
An excerpt from the new biography “Elon Musk.”
12:00
A Cometary Awakening, a Vaccine Mystery, and Brand New Bacteria
Tariq Malik of Space.com talks about Philae’s unexpected awakening, and Arielle Duhaime-Ross helps decipher a mystery that has plagued scientists for 50 years.
7:14
Could Mars Have a Cold, Icy Past?
The ancient climate of Mars may have been cold and icy, according to researchers.
A Human Sundial
Why does the length and direction of our shadow change throughout the day? It all comes back to rotation and position of our planet relative to the sun.
24:16
One Year Aboard The Space Station
Astronaut Scott Kelly—aboard the International Space Station—and his Earth-bound twin brother, Mark, talk about the effects of living in space for one year.
Solar Convection
Use hot and cold water to see how fluids at different temperatures move around in convection currents in this DIY Sun Science Activity from Lawrence Hall of Science.
17:44
Neal Stephenson Versus the Moon
Neal Stephenson’s new novel “Seveneves” blasts humanity into orbit, only to bring them down to earth…five thousand years later.
Map Sun Trails
Use photosensitive paper to make a map of the path of sunlight on the earth in this activity from the Lawrence Hall of Science.