This photo, taken from the International Space Station, shows the European peninsula of Iberia (consisting of Spain and Portugal) from above. Far, far above. [via National Geographic]
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?
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.
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.
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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