Just small rocks (called metheorites), remainders of bigger rocks, comets, planets, stars and/or any other objects travelling across universe.
Although it reaches incredible speeds, a Space Shuttle is not going fast when it enters the atmosphere. The gravitational pull of Earth, or just gravity, are pulling down on the space shuttle with immense force.
speeds up
It is only possible to escape the Earth's gravity by moving away from it at approximately seven miles per second. Seeing as it is very difficult to move at such high speeds by accident, it would not be possible to accidentally leave the atmosphere.
meters and kilometers
These are meteoroids, small pieces of rock debris in space. They enter the earths atmosphere at high speeds, burning up brightly as shooting stars for a brief period due to the friction against the gas in the atmosphere - at this point they are referred to as meteors. If any surviving pieces are found on the surface, they are called meteorites. Since the moon has no atmosphere, meteoroids are able to survive the decent more easily, since there is no gas to cause them to burn up through friction.
meteors!:)
It will most likely burn up through the earths atmosphere on re-entry. The satellites travel at very high speeds, and are not designed to withstand the brunt of the earths atmosphere at the speeds at which they orbit the earth. You might get some bits left over, but these should be quite small. Operators try to land the satellite in the sea once it has reached the end of its life.
The SI unit is meters/second. Also in common use is kilometers/hour, or (for high speeds, such as those that occur in astronomy) kilometers per second. In the United States, miles/hour is used instead.
There are no wind speeds to discuss on Mercury, since there is no atmosphere there.
When the altitude on Earth increases, the temperature decreases. The reason spacecraft are incredibly hot upon re-entry into the Earth's atmosphere is due to the friction of the molecules in the atmosphere on the spacecraft, which are traveling at extremely high speeds.
Although it reaches incredible speeds, a Space Shuttle is not going fast when it enters the atmosphere. The gravitational pull of Earth, or just gravity, are pulling down on the space shuttle with immense force.
it travels at many different speeds depending on the position of its orbit at the time, it has been recorded going about 1 kilometer per second and 1.91 kilometers per second.
Jet streams blow at speeds of 200 to 400 kilometers per hour.
There is no wind because Mercury has no significant atmosphere.
speeds up
There is evidence of wind on the planet Jupiter. Winds can reach speeds of 100 meters per second, or 360 kilometers per hour.
Because in the case of the speeds, the measures of time are in the denominator (as indicated by "PER").