Mercury

Mercury is the first planet in the Sol System.

4,599,900,000 - 4,590,000,000 years ago

 * Mercury formed.

3,300,000,000 years from now

 * 1% chance of happening, Mercury will collide with Venus, then they wil collide with Earth.

7,900,000,000 ​years from now

 * Mercury may be destroyed by the Sun's expansion.

Other Facts

 * Mercury is the smallest planet in the Sol System.
 * Mercury's atmosphere is made of:
 * Molecular oxygen (42%)
 * Sodium (29%)
 * Hydrogen (22%)
 * Helium (6%)
 * Potassium (0.6%)
 * Trace amounts of argon, nitrogen, carbon dioxide, water vapour, xenon, krypton and neon.
 * Mercury's average surface temperature is 427°C in the day and  -173 °C at night.