Some cool facts about the Universe

The solar system:

Sun is the most perfect sphere ever observed in the universe.Light is created inside sun’s core, but it takes 30,000 years for it to reach 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.Helix nebula and Andromeda galaxy would be clearly visible in the sky given- no light pollution, no decrease in brightness over distance. Andromeda would be six times the size of moon and helix nebula about the size of moon. Google the pictures of Andromeda and helix and imagine how beautiful it would look. :-) (The brightness of Andromeda in this image is highly exaggerated)

Mercury is the only planet smaller than a natural satellite of any planet. (Ganymede>Mercury)Venus is the hottest planet in solar systemnot mercury.Earth is the densest planet in solar system.Earth is the most massive solid body in solar system. List of Solar System objects by size. (Sun, Jupiter, Saturn- Gaseous || Uranus, Neptune- Icey)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.Average distance between asteroids in asteroid belt is almost 1 million kms- 3 times dist. between earth and moon. Not so crowded as shown in pictures!Distance between Sun and Jupiter is almost equal to distance between Jupiter and Saturn.Mass of Jupiter=2.5 times ‘Mass of all planets combined’Neptune was mathematically predictedbefore it’s discovery.

Rest of the universe:

Average temperature of the universe or temperature of empty space is 2.73 Kelvin.But lowest temperature recorded in universe is on earth. Scientist 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. Largest galaxy IC 1101 is 6,000,000 ly across.Largest structure in universe is supposedly 6 to 10 billion ly across- Hercules-Corona Borealis Great Wall Not only there are super huge structures but universe has supervoids too. 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 as the most violent type of explosions in the universe.Supernovae can briefly outshine the parent galaxy and emit more energy that the star has emitted over it’s entire lifetime.