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Planetarium

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Planetarium, is an educational device for showing the locations and movements of the planets and other objects in the universe.

Planetesimal Hypothesis

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Planetesimal hypothesis is a theory of the origin of the solar system. It was proposed by Forrest R.

Plants Can Defend Themselves by Making Caterpillars Turn Cannibal

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How can plants defend themselves against insects? Learn more about a new tomato study in this HowStuffWorks article.

Plastic Numbers: Breaking Down Recycling Codes

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There are seven different numbers you might see on a plastic container. And each number has its own meaning.

Plastics Will Outpace Coal in U.S. Carbon Emissions, Study Shows

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A new report released by Beyond Plastics suggests that plastics will release more greenhouse gas emissions than coal plants in the U.S. by 2030.

Platinum: What's So Special About the Shiny Metal?

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This white-hot metal not only makes beautiful jewelry, it's coveted for industrial, medical and military purposes too.

Ploonets: When Moons Become Planets

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Moons of giant planets outside the solar system may be pushed out of their orbits and begin to circle their stars separately. HowStuffWorks takes a look.

Pluto Is Just One of Millions of Objects in the Kuiper Belt

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The Kuiper Belt is a ring around the sun that's home to millions of comets, moons, dwarf planets and other celestial objects. How did they get there?

Pluto: Is It a Planet After All?

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Back in 2006, the International Astronomical Union decided to demote Pluto to the status of a dwarf planet. A historical study challenges that designation.

Poisonous Death Cap Mushroom Spreads Over North America

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Amanita phalloides is non-native to the North American continent, introduced to California from Europe, and rapidly spreading.