Mercury is smaller than it's Moon: Amazing Facts about Universe

The universe is bigger than we think. And has some interesting and mysterious facts hidden inside it. We will discuss some of the very cool facts about Universe today: 

• Mercury is smaller than its moon or natural satellite(Ganymede>Mercury).
• Venus is the hottest planet in the solar system, not mercury.
• Earth is the densest planet in the solar system.
• Earth is the most massive solid body in the solar system.
• Moon is not as close as we think. (To-scale image of earth and moon).
• Though outer planets are way bigger than the Earth, gravity is almost the same, except for Jupiter.
• The average distance between asteroids in the asteroid belt is almost 1 million km- 3 times dist. between earth and moon. Not so crowded as shown in pictures!
• Distance between Sun and Jupiter is almost equal to the distance between Jupiter and Saturn.
• Mass of Jupiter=2.5 times ‘Mass of all planets combined’
• Neptune was mathematically predicted before it’s discovery.
• The average temperature of the universe or temperature of space is 2.73 Kelvin. But the lowest temperature recorded in-universe is on earth. Scientists have achieved up to 10^(-10) Kelvin. This is pretty cool.
• The Milky Way is 100,000 ly across. Neighbor Andromeda is 200,000 ly across. The largest galaxy IC 1101 is 6,000,000 ly across.
• The largest structure in the universe is supposedly 6 to 10 billion ly across- Hercules-Corona Borealis Great Wall.
• Not only there are super huge structures but the universe has supervoids too. The largest void in space is >1 billion ly in diameter. It is void of not only matter but also dark matter- It is a cold spot.
• Fastest Pulsar star spins with 716 rotations per second. Hence it’s equator speed is very close to the speed of light.
• Gamma-Ray Bursts (GRBs) are considered the most violent type of explosions in the universe.
• Supernovae can briefly outshine the parent galaxy and emit more energy than the star has emitted over its entire lifetime.
• Sun is the 2nd most perfect sphere ever observed in the universe. It was most spherical till 17th Nov. 2016. Now the title goes to Kepler 11145123.
• Light is created inside the sun’s core, but it takes 30,000 years for it to reach the sun’s surface i.e. time lag between production of light and emission from surface is tens of thousands of years.
• Sun appears white from space, not yellow.