racing games

Mercury

Mercury

The planet Mercury is the closest planet to the Sun within the solar system. Mercury was named by the Romans after their god of the same name. Due to its small angular separation from the Sun, which it orbits every 88 days, Mercury is not easily seen from Earth.

At this time, little is known about this comparatively small planet. The only spacecraft to come close to Mercury was Mariner 10 from 1974 to 1975, which was only able to map 40%–45% of the planet's surface.

From the photographs and other information that has been collected, it has been determined that the surface of Mercury is very similar to our own moon, heavily cratered and barren. The magnetic force generated by Mercury’s iron core is only about 1% as strong as that of Earth’s. Temperatures on Mercury can range anywhere from 90 to 700 degrees K!

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Doodle Bring your doodle to life and battle the enemy erasers.

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On The Run You have documents that the 'Corporation' want. Can you escape?

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One of the most popular HowStuffWorks articles is How Car Engines Work, which explains the basic principles behind internal combustion, discusses the four-stroke cycle and talks about all of the subsystems that help your car's engine to do its job. For a long time after we published that article, one of the most common questions asked (and one of the most frequent suggestions made in the suggestion box) was, "What is the difference between a gasoline and a diesel engine?"
If you haven't already done so, you'll probably want to read How Car Engines Work first, to get a feel for the basics of internal combustion. But hurry back -- in this article, we unlock the secrets of the diesel.


The Diesel Cycle
Rudolf Diesel developed the idea for the diesel engine and obtained the German patent for it in 1892. His goal was to create an engine with high efficiency. Gasoline engines had been invented in 1876 and, especially at that time, were not very efficient.

The main differences between the gasoline engine and the diesel engine are:

A gasoline engine intakes a mixture of gas and air, compresses it and ignites the mixture with a spark. A diesel engine takes in just air, compresses it and then injects fuel into the compressed air. The heat of the compressed air lights the fuel spontaneously.

A gasoline engine compresses at a ratio of 8:1 to 12:1, while a diesel engine compresses at a ratio of 14:1 to as high as 25:1. The higher compression ratio of the diesel engine leads to better efficiency.

Gasoline engines generally use either carburetion, in which the air and fuel is mixed long before the air enters the cylinder, or port fuel injection, in which the fuel is injected just prior to the intake stroke (outside the cylinder). Diesel engines use direct fuel injection -- the diesel fuel is injected directly into the cylinder.
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saturn

Photogenic Saturn has now become a movie star. Astronomers have woven NASA Hubble Space Telescope images of Saturn, its rings, and several of its moons into three movies. Each movie highlights unique times in the planet's 30-year waltz around the Sun. Two of the movies show the motion of several of Saturn's moons when the planet's rings were tilted nearly edge-on to Earth and to the Sun. These edge-on alignments of the rings occur roughly once every 15 years. Another movie presents a clear view of Saturn's Southern Hemisphere when the planet's rings were at maximum tilt toward Earth. Hubble snapped only about a dozen images during each of these three events, so astronomers created software to extend the photos into the hundreds of images needed for a movie. The images were taken with Hubble's Wide Field and Planetary Camera 2 in 1995 and the Advanced Camera for Surveys in 2003

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