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How is GPS used in spaceflight?

science.howstuffworks.com/how-is-gps-used-in-spaceflight.htm

GPS is great, but it's kind of Earth-centric. If we have our hearts set on traveling to distant planets and faraway stars, then it's time to come up with a new navigation system. NASA, of course, has an idea.

How is carbon dioxide eliminated aboard a spacecraft?

science.howstuffworks.com/carbon-dioxide-eliminated-aboard-spacecraft.htm

To get carbon dioxide eliminated aboard a spacecraft you need a system similar to SCUBA. Learn about carbon dioxide elimination.

How is green nanotechnology being used?

science.howstuffworks.com/environmental/green-science/green-nanotechnology.htm

How is green nanotechnology being used? Learn about green innovations and technologies in the field of green nanotechnology.

How is oxygen made aboard a spacecraft?

science.howstuffworks.com/oxygen-made-aboard-spacecraft.htm

Oxygen made aboard a spacecraft is done through the use of oxygen generators. Learn about oxygen made aboard a spacecraft.

How is volcanic ash made?

science.howstuffworks.com/nature/natural-disasters/volcanic-ash.htm

Volcanic ash is what's left after a volcano literally blows its top. Learn how volcanic ash can devastate everything under its gray blanket.

How long can a human survive in outer space?

science.howstuffworks.com/question540.htm

How long can a human survive in outer space? In science fiction movies, this seems to be an area of much creative license, with some people exploding instantly, and others surviving for nearly a minute without long-term ill effect. I read once that one's blood would boil, but I read elsewhere that this isn't true. So what is it?

How long does it take for Zoloft to work?

science.howstuffworks.com/life/inside-the-mind/human-brain/how-long-zoloft-work.htm

Odd as it may seem, many antidepressants like Zoloft having warning labels about increases in suicidal thoughts. Why would that be? And how will you know if your medication is actually working?

How long does it take to excavate an archaeological dig site?

science.howstuffworks.com/environmental/earth/archaeology/excavate-archaeological-dig-site.htm

To excavate an archaeological dig site a great deal of time and patience is required. Find out how long it takes to excavate an archaeological dig site.

How many atoms are in a person?

science.howstuffworks.com/atoms-in-person.htm

Atoms: the building blocks of life and the universe. We're all made of these microscopic bits of matter, but how many does it take to make a complete human being? And exactly what kinds of atoms do we have inside us?

How many planets in our universe could support life?

science.howstuffworks.com/planets--universe-support-life.htm

We don't know the answer to how many civilizations might exist in the universe. But we do know the factors that allow life on Earth. Are there other planets that fit the bill? Oh yes indeed.

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