mercury

 

#Mercury

1.   Mercury was formed about 4.5 billion years ago.

2.   Smallest planet

3.   Nearest to the sun .

4.   Mercury is only slightly larger than Earth's moon.

5.  Mercury is 2.6x smaller than Earth.

6.   Second densest planet while Earth is first.

7.   According to Nasa, closest planet to sun at a distance of about 36 million miles ( 58 million km ) or .39 AU.

8.     Mercury is not hottest planet

9.     According to Nasa , one day on Mercury takes 59 earth days.

10.   According to Nasa , one day night cycle on Mercury takes 175.97 earth days.

11.   Mercury makes a complete orbit around the sun in just 88 days .

12.  Mercury is a Rocky planet, also known as terrestrial planet.

13.   Mercury has a solid , cratered surface, much like the Earth's moon.

14.   Mercury's thin exosphere is composed of mostly,

1.  Oxygen
2.  Sodium
3.  Hydrogen
4.  Helium
5.  Potassium

15.    Mercury has no moons

16.    There are no rings around mercury.

17.    According to Nasa , daytime temperature can reach 430 degrees Celsius ( 800 degree Fahrenheit).

18.     Radius of mercury is 1516 miles ( 2439.7 km )

19.    Density of mercury is 5.43 g/cm³.

20.    Diameter of mercury is 4879.4 km .

21.    Mercury is .4 astronomical units away from sun.

22.    It takes sunlight 3.2 minutes to travel from sun to mercury.

23.    Mercury has a largest metallic core with a radius of about 1289 miles ( 2074 km), about 85% of planet's radius.

24.   Mariner 10 ( 1974-1975) was the first mission to explore mercury.

25.  NASA's messenger was the first to orbit the innermost planet ( 2015).

26.   Mercury's outer shell , comparable to earth' s outer shell( called mantle and crust).