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Physics Facts

Carbon Dating From The Skies

Determining the age of relatively recent fossils, those of plants and animals that lived tens of thousands of years ago, is not a guessing game but an exact science. By using carbon dating we can ... Continue reading

Carbon dating the bones of an animal can pinpoint the time this animal died to within a few years.

Nuclides & Isotopes

An atom that has an unbalanced ratio of neutrons to protons in the nucleus seeks to become more stable. The unbalanced or unstable atom tries to become more stable by changing the number of neutrons ... Continue reading

Somewhere Over Which Rainbow?

How many rainbows are there really when we only see one during a rainstorm? The answer isn't as simple as you might think! Rainbows are formed when light enters a water droplet, reflects once inside ... Continue reading

Double rainbow, note the color reversal in the faint, secondary rainbow.

Ultraviolet Light

Ultraviolet light is a form of radiation which is not visible to the human eye. It's in an invisible part of the 'electromagnetic spectrum'. Radiated energy, or radiation, is given off by many ... Continue reading

Images from the EIT (Extreme-ultraviolet Imaging Telescope) instrument on the SOHO spacecraft.