Norman Loeb studies clouds’ effect on Earth’s climate

"I think society needs to realize the importance of accurately measuring the climate system ," says Norman Loeb when talking about the goals of CERES mission.

Scott Barrett on crafting a successful climate agreement in Copenhagen

"The biggest problem we've had in this long history of climate negotiations is a focus on targets and timetables - on aspirations," says Scott Barrett.

Balloons: How high can they fly?

Helium balloons rise higher than hot air balloons. The current altitude record for a helium balloon was set by Malcolm Ross, who flew to over 113,000 feet.

What causes the colors in flames?

When you gaze at a wood fire, you might notice different colors in flames. What causes them? It's like the colors of stars indicate their temperatures.

Is twilight shorter at the equator?

The sun drops quickly down toward the horizon - and just as quickly sinks below the horizon - as seen from Earth's equatorial latitudes.

Nancy Moreno on butterflies launched into space

Nancy Moreno explained that the butterflies in space experiment will help scientists - and students - understand how gravity influences growth.

‘Mowing the lawn’ at high altitude

The ICE Bridge mission - dubbed "mowing the lawn" has been so successful that eight flights will be added keeping us in Chile until Thanksgiving.

Peter Gleick warns that world faces a water crisis

Forty percent of the world's population doesn't have access to adequate sanitation services, says water expert Peter Gleick.

Jeff Mount on what it really means to restore a river

Jeff Mount said today, river restoration is about creating healthy ecosystems that can sustain human demands and provide benefits to neighboring ecosystems

Shackleton to satellites: Field-work and exploration

The Shackleton ill fated expedition in Antarctica comes to mind when we consider the perils of field-work in early Antarctic exploration.

2026 Donation Campaign

If EarthSky has ever helped you discover something new, prepare for an eclipse, spot a planet, or simply inspired a moment of wonder, today is the perfect day to give back. Your donation helps keep trusted science news, expert night sky guides, and independent science journalism free for everyone.

Please help keep EarthSky going by donating today!

Please help keep

EarthSky Going!

If you've already donated, we apologize for the popup and greatly appreciate your support.