DICTIONARY LOOKUP
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Our Nearest Neighbor
Our moon makes Earth a more livable planet by moderating our home planet's wobble on its axis, leading to a relatively stable climate, and creating a tidal rhythm that has guided humans for thousands of years. The moon was likely formed after a Mars-sized body collided with Earth and the debris formed into the most prominent feature in our night sky.

Earth's Moon Icon
Just the Facts
Just the Facts
Dig Deeper
Dig Deeper
Dig Deeper
Create Your Report
Create Your Report
Even More Stuff...
Even More Stuff...
  News Features People Extreme Facts Dictionary

 
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X-ray

Light that is so blue humans cannot see it. A band of the spectrum between the ultraviolet and the gamma-ray. Photons of X-ray light are more energetic than photons in the ultraviolet but less energetic than photons in the gamma-ray. X-radiation can go through human skin tissue but is stopped by dense bones. This property thus makes X-rays valuable in medicine. It is also useful in observing outer space. Scientists used X-rays to discover strange auroral disturbances at Jupiter's north and south poles. (See image on right)

X-Ray Image of Jupiter
 
Can't find it? Don't understand it? Ask us.
Q
X-ray

Light that is so blue humans cannot see it. A band of the spectrum between the ultraviolet and the gamma-ray. Photons of X-ray light are more energetic than photons in the ultraviolet but less energetic than photons in the gamma-ray. X-radiation can go through human skin tissue but is stopped by dense bones. This property thus makes X-rays valuable in medicine. It is also useful in observing outer space. Scientists used X-rays to discover strange auroral disturbances at Jupiter's north and south poles. (See image on right)

X-Ray Image of Jupiter