A Moment of Science

Posts tagged altitude

January 30, 2014

 

The underside of a commercial airliner taking off at sunset

Why Airliners Don’t Provide Emergency Parachutes

There are emergency exits, emergency slides, emergency air masks and emergency flotation devices. Why not parachutes too?

March 6, 2012

 

mountain climber on a mountain

Why Does Altitude Cause Headache?

Mountain climbers face many dangers as they brave the cold winds of the peaks they climb. But the most serious thing they face is all in their heads--literally.

June 5, 2009

 

Moon over colorful cityscape

Why Doesn’t the Moon Fall Down?

Contrary to what fairy tales tell us, there is nothing holding the moon up in the sky. So why doesn't it fall down? Find out on this Moment of Science.

April 14, 2009

 

Inside train tunnel

Popping Ears on a Train

When a train enters a tunnel, it compresses the air in front of it like a piston. Air in a tunnel can't be simply pushed aside--the tunnel walls are in the way.

December 20, 2005

 

Chinook Crazy

Doesn't heat rise and aren't mountaintops often damp and cold? Learn more on this Moment of Science.

November 23, 2005

 

Haul Me Up or Haul You Down?

We’ve been imagining that we’re sitting in a geostationary satellite. That’s a satellite that orbits the equator at the same speed and direction as the earth turns. That means it’s always over the same spot of land, as if it were floating in the sky 22,500 miles up. We let down a rope to pull up some supplies. Will this work? Learn more on this Moment of Science.

January 3, 2005

 

A Stationary Satellite, part 2

Learn about stationary satellites on this Moment of Science.

September 27, 2003

 

Floating Clouds

Clouds form when warm, moist air rises to a greater altitude, causing it to expand and cool. Eventually, water vapor in the cooled air condenses into the droplets that form clouds.

September 27, 2003

 

The Moon and its Orbit

You can see this more easily by imagining what would happen if the earth were flat. The moon would still travel in a horizontal line above the ground; but because it’s also falling, it would come closer and closer to the flat earth until it collided.

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