Colors of the Universe
It's not all black and white.
Earth, Neptune, and Uranus are all blue because of gases in their atmosphere.
These are the hottest stars, with a surface temperature of more than 37,000°F.
These are warm stars, such as the Sun. Their temperature is about 10,000°F.
The coolest stars are red. Their surface temperature is less than 5,500°F.
When light coming from a distant star is seen through a spectroscope (an instrument that separates light into its different colors), the light we receive continues to shift toward the red area of the spectrum, which is the least powerful. This means that, since the light is becoming weaker and weaker, the stars must be traveling away from us. This makes scientists believe that our universe is expanding.
A swirling cloud on the planet Jupiter is a raging storm of gases, mainly red phosphorus.
Information Please® Database, © 2007 Pearson Education, Inc. All rights reserved.
More on Colors of the Universe from Infoplease: