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Exploratour - Life in the Solar System, page 4 - Windows to the Universe
Exploratour - Life in the Solar System
This is an image of the surface of Mars.
Click on image for full size
NASA
Now let's discuss what we know today about the planets in the solar system. Mercury is the closest planet to the Sun, and it orbits the Sun in a variation of a condition called "tidal lock". Tidal lock usually means that the planet always has the same face toward the Sun. Mercury rotates about 1 1/2 times the speed at which it goes around the Sun, so it keeps the same face toward the Sun for a long time.
Mercury also has little atmosphere. Scientists have detected the presence of atmospheric molecules, but there are so few molecules that it is hard to call it an atmsophere. With so little atmosphere, there cannot be a greenhouse effect to keep the temperatures warm and equally distributed between the side of Mercury which faces the Sun and the side of Mercury which faces away from the Sun. The side of Mercury which faces away from the Sun will be very cold because it is virtually directly exposed to space. The side of Mercury which faces the Sun will be very hot! This means that life forms would have to survive both the extreme heat as well as the extreme cold. That is hard to do.
Such life forms would also have to survive the extreme radiation (another name for "charged particles") found in the environment near the Sun. Such radiation has enough energy to break apart long molecules required by life, so it would be difficult for life to get started on Mercury. The magnetosphere of the Earth protects the Earth from these particles streaming away from the Sun. Mercury has a magnetosphere, but is it much smaller than the Earth's, and Mercury is much closer to the Sun.
You can leave the tour and read more about the greenhouse effect by leaving this tour and linking to the greenhouse effect at the bottom of this page. Or read about terrestrial bacteria called Archaea which can survive extreme heat.
This is page 4 of 20
You might also be interested in: Look at the bed below the body of the sleeping man. You can still see where he was lying down. The heat from his body warmed up the bed sheets which are now radiating infrared light toward your eyes.
...more All warm objects (not just people) release infrared light. Warmer objects give off more infrared light. Very hot objects radiate other types of light as well. Click on the picture to see the infrared
...more What kinds of light can people see? Our eyes can see visible light. When it passes into our eyes different types of visible light create different sensations that we see as colors.
...more Imagine you found a pair of special glasses that not only gave you telescopic vision but gave you the ability to see all forms of radiant energy. The universe in visible light contains all the familiar
...more This is a volcano on the island of Miyake in Japan. It has erupted, sending hot lava and ash into the air, a total of ten times. The time after one eruption until the next occurred was about twenty years
...more This is a picture of a galaxy in visible light. A galaxy is a large number of stars, some like our sun, some bigger, some smaller and all moving together through space. This galaxy is called Centaurus
...more This is a plant in Gary, Indiana where power is made. We use power to run things like television sets, radios, lights, and microwave ovens. The picture looks very strange because it was taken in infrared.
...more