Earth's Atmosphere

Unlike the moon Earth as a very protective atmosphere. Earth been impacted by the same amount of meteorites as the moon , but Earth has an atmosphere so the crater washed away in a short time. On the moon though a crater can stay on the surface of the moon for 4 billion years. Earth's atmosphere can also keep heat in it and keep heat out which makes it possible for humans to live on Earth. The ozone layer protects Earth and the life on it from ultra violet rays. The moon can't keep its own heat in or out without an atmosphere so the temperatures on the moon are very extreme. Earth can also hold gases in its atmosphere. This makes it possible for human existence. Earth's atmosphere is suitable for living things it can hold in gases and heat, therefore it is different from the moon.

Space Exploration

Space Exploration

The Science Of Rockets
Since the late 1950's NASA has used Atlas rockets. With Atlas rockets NASA is able to launch probes into space and satellites into orbit around Earth. Atlas rockets have been used in many missions for governmental and commercial enterprises.
The Space Program
NASA or The National Aeronautics and Space Administration began in 1958. Apollo 13 was launched on April 11, 1970and only spent 6 days in space. Instead of space rockets they launched probes into space.
Exploring Space Today
A new type of small robot for the International Space Station is called a personal satellite assistant floats next to an astronaut. The robot is powered by solar cells. The robot has not only camera and light but also a videophone.
Using Space Science On Earth
NASA says less than 1 percent of the U.S. budget is spent on the space program. NASA stresses its contribution to the country's economic welfare because many people think the funding should go towards education or medical research.