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June 2013: American Energy Independence
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.
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This was a great week for images. What an amazing world we live in
I hate you, PopSci. How does a star rotate at 1 million "miles per hour?"
Also, centrifugal force? Really?
@tyronemojojohnson:
Both those statements are pretty much straight from the source (go read the linked NASA page). The way it rotates at "miles per hour" is that you mark a spot on the surface and then measure the length of time that spot takes to make one rotation. Knowing the diameter of the star and time to make a trip around the diameter, you can calculate a linear speed in terms of whatever units you want (i.e., miles per hour).
what is that layer of green in the atmosphere?
to NekoMouser: don't you mean mean circumference, even though you can calculate circumference from diameter. sorry, wouldn't think tryo would be capable to think of that.
@ tyronemojojohnson: centrifugal force? you don't believe in it? how can you not believe in inertia? why does it take more energy for a vehicle to change direction while maintaining speed than to maintain speed going straight? a force called inertia, it wants to keep the car going in the direction in which you were going, while you are trying to make it go in a new direction. hopefully you understand now. maybe you should try wikipediaing centrifugal force.
what is that layer of green in the atmosphere?
+1
In the description of the LED lamp, PopSci mis-quoted the numbers in the Gizmodo article. It takes 10 apples to power EACH LED of the 30 LED lamp. So 300 apples total.