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.
17:26
Tracking Your Local (Space) Weather
How—and why—scientists keep a close eye on the activity of our nearest star.
12:14
NASA Budget Cuts Impact Earth-Based Science
The House Committee on Science, Space, and Technology passed a bill that would cut NASA’s earth science budget by roughly 20 percent.
77:37
Science Friday, Live From Huntsville
Hear the full show as Ira and Science Friday take the stage at Huntsville, Alabama’s own U.S. Space & Rocket Center.
Spot the Sunspots
Use binoculars or a telescope to identify and track sunspots. You’ll need a bright sunny day for this DIY Sun Science Activity from Lawrence Hall of Science.