Water is the only substance on Earth that exists naturally in three states: solid, liquid, and gas. The formula of water is H2O, meaning each molecule consists of two hydrogen atoms and one oxygen atom. and the Equation of Eienstein's theory of relativity is E=mc², which shows the relationship between energy (E), mass (m), and the speed of light (c). The speed of light in a vacuum is approximately 299,792 kilometers per second (or about 186,282 miles per second). The human body contains about 60% water, which is essential for all life processes. The Earth is about 4.5 billion years old, and it has gone through many changes since its formation. The universe is estimated to be about 13.8 billion years old, and it is still expanding. The Milky Way galaxy, which contains our solar system, is about 100,000 light-years in diameter. The Earth rotates on its axis once every 24 hours, which creates day and night. The Earth orbits the Sun once every 365.25 days, which defines a year. The Moon orbits the Earth once every 27.3 days, which creates the lunar phases. The Sun is a star that is about 4.6 billion years old, and it is the center of our solar system. The Sun is about 109 times larger than the Earth, and it contains about 99.86% of the total mass of the solar system.
NASA is the United States government agency responsible for the nation's civilian space program and for aeronautics and aerospace research and responsible for US Space proogram.
| Planet | Distance From Sun (*10⁶km) | Average Number (℃) |
|---|---|---|
| Mercury | 0.39 | 167 |
| Venus | 0.72 | 464 |
| Earth | 1.00 | 15 |
| Mars | 1.52 | -65 |
| Jupiter | 5.20 | -110 |
| Saturn | 9.58 | -140 |
| Uranus | 19.22 | -195 |
| Neptune | 30.05 | -200 |
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