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Posts by
Editors of EarthSky
How do we know the shape of our galaxy?
The answer is ... we don't. But astronomers make educated guesses about the shape of our galaxy, in part by looking into space at other galaxies.
October 29, 2009
What is wind chill?
If you any warm object and expose it to cold air, that object will lose heat to the air. Wind chill refers to greater heat loss due to the motion of the air.
October 29, 2009
Christopher Flavin says wind power surging
Christopher Flavin said over 40 percent of the new generating capacity added in the U.S. last year is from wind power. It's surpassed a little by natural gas.
October 26, 2009
Is it a coincidence that moon keeps one face to Earth?
The moon spins once for each of its orbits around Earth - and that's why the moon always keeps a single face turned our way.
October 19, 2009
Does every animal have eyelids?
Fish and snakes don't have eyelids. Some lizards have 2! Why we need eyelids ...
October 19, 2009
Could penguins and polar bears swap habitats?
Earth's Arctic and the Antarctic are very different kinds of places - but if these polar animals switched habitats, penguins might struggle, and polar bears might thrive.
October 19, 2009
What’s so special about water?
Water is unusual in that it can occur naturally in three distinct forms - gas, liquid and solid - at the same time.
October 18, 2009
Do animals laugh, is it in animal behavior?
Do animals laugh? If you tickle a chimp, it'll make a panting noise that sounds like a handsaw cutting wood. When dogs play, they wag their tails.
October 9, 2009
Why is Jupiter called a failed star?
Jupiter is the biggest planet in our solar system, but it isn't massive enough to be a star. Stars require a certain amount of mass to spark thermonuclear fusion - in other words, to shine.
October 9, 2009
Gravity, does it have a specific speed?
Today's scientists theorize that gravity might travel in space at light speed, as a massless particle called a "graviton."
October 9, 2009
