There is no atmosphere in space, which means that sound has no medium or way to travel to be heard. 

Venus is the hottest planet in the solar system and has an average surface temperature of around 450° C. Did you know that Venus isn't the closest planet to the sun?  That is Mercury.  You would think that Mercury would then be the hottest, but Mercury has no atmosphere (which regulates temperature), resulting in big fluctuations. 

While the entire suit costs a cool $12m, 70% of that cost is for the backpack and control module. However, the space suits that NASA uses were built in 1974.  If these were priced by today's pricing, they would cost an estimated 150 million dollars!

The Sun accounts for 99.86% of the mass in our solar system with a mass of around 330,000 times that of Earth. Did you know that the Sun is made up of mostly hydrogen (three quarters worth) with the rest of its mass attributed to helium.  If the Sun had a voice would it be high and squeaky from all that helium?

5.  ONE MILLION EARTHS CAN FIT INSIDE THE SUN

The Sun is large enough that approximately 1.3 million Earths could fit inside (if squashed in) or if the Earths retained their spherical shape then 960,000 would fit. But can you visualise that number of Earths?

There are about three trillion trees on Planet Earth, and between 100-400 billion stars, approximately, in the galaxy.

7. THE SUNSET ON MARS APPEARS BLUE
Just as colors are made more dramatic in sunsets on Earth, sunsets on Mars, according to NASA,  would appear bluish to human observers watching from the red planet. Fine dust makes the blue near the Sun's part of the sky much more visibilke, while normal daylight makes the Red Planet's familiar rusty dust color the most perceptible to the human eye.

8. THERE ARE MORE STARS IN THE UNIVERSE THAN GRAINS OF SANDS ON EARTH
The universe extends far beyond our own galaxy, The Milky Way, which is why scientists can only estimate how many stars are in space.  However, scientists estimate the universe contains approximately 1,000,000,000,000,000,000,000,000 stars, or a septillion.   While no one can actually count every single grain of sand on the earth, the estimated total from researchers at the University of Hawaii, is somewhere around seven quintillion, five hundred quadrillion grains.  That is an awfully big sand castle!

9. ONE DAY ON VENUS IS LONGER THAN ONE YEAR.
Venus has a slow axis rotation which takes 243 Earth days to complete its day. The orbit of Venus around the Sun is 225 Earth days, making a year on Venus 18 days less than a day on Venus.

10. THERE IS A PLANET MADE OF DIAMONDS
There’s a planet made of diamonds twice the size of earth The "super earth," aka 55 Cancri e, is most likely covered in graphite and diamond.  Paying a visit to that planet would probably pay for the $12 million dollar space suit needed to get there! 

2. How do astronauts eat their ice creams? 

3. How are prisoners like astronauts? 

4. From the beginning of eternity To the end of time and space To the beginning of every end And the end of every place. What am I?

5. Blacker than black, colder than cold, some things out here are worth more than gold. What is it? 

6. A man was just doing his job when his suit was torn. Why did he die three minutes later?

7. A glow in the dark, A place without life, Where a small spark, Means the greatest strife. Where am I?

8. If a wheel has 64 spokes, how many spaces are there between the spokes? 

9. I’m named after a Roman God, I’m the fourth planet from the sun, I am known as the red planet, And have two moons rather than one.

10. I’m behind you In front of you And all around. What am I? Answer: Space.

11. I’m a god, a planet, and a measurer of heat. Who am I?

12. I can kill people, but without me, there would be no people. I was born long ago and will someday die. I can cause fire and am a magician with water. I have more brothers than any person. It is very little that can stop me. What am I?

13. I can be half without getting thinner. I can shine with no fire. I can be hidden but never taken. I can stay dry while moving through the ocean. What am I?

14. I am the hottest body in the solar system. I keep everyone warm. What am I? 

15. I am something in the sky. That seems to shine at night. However, I'm not a star. I am Earth’s satellite. What am I?

16. I am bigger than Venus but smaller than Uranus. I am a living rock. What am I?? 

17. I always follow you around, everywhere you go at night. I look very bright to people, but I can make the sun dark. I can be in many different forms and shapes. What am I?

18. How does the man-in-the-moon cut his hair?

19. Where do astronauts leave their spaceships?

20. How does Einstein begin a story? 

21. Some planets have many of these, But for our planet, there is only one, It causes a solar eclipse When it gets between the Earth and the sun. What is it?

22. People have stepped on me, but not many. I never stay full for long. I have a dark side. What am I?

23. It’s been around for millions of years, but it’s no more than a month old. What is it?

24. It can fill a room without occupying space. What is that? Answer: Light.

25. I’m full of gas but I’m, not a car, I have many rings but I’m, not a jewellery store, I’m a Roman god but I’m, not Janus, I’m a large planet but I’m, not Jupiter. What am I?

26. If you look up during the day. Then you will see this lit. Because it is Earth’s closest star. Around which we orbit. What is it? 

27. If you go to outer space. And head away from the sun. The first planet you would reach. Would be this red, dusty one. Which planet is it?

28. What is an astronaut’s favourite chocolate?

29. What is an alien’s favourite outdoor game to play with humans?

30. What do you call an alien with three eyes?

31. What do you call a wizard from outer space that can fly?

32. What did the spaceman say when he set foot on a giant chocolate bar?

33. What did Mars say to Saturn? Answer: Give me a ring sometime!

34. What can fill a room but takes up no space?

35. These are giant balls of gas, Many light years away, Most are only seen at night, Although ones are seen in the day.

36. When looking at the solar system. These planets are between Venus and Mars. You won’t see any flying saucers. But you can find people in their cars. What is it? 

37. What type of songs do the planets sing? 

38. What snack does the Man in the Moon like?

39. What sea is in space?

40. What only starts to work after it’s fired? 

41. What object has keys that open no locks, space but no room, and you can enter but not go in?

42. What kind of music can you hear in space?

43. What kind of drinks do aliens like best? 

44. What is yellow, looks like the moon, and has seeds?

45. What is the best way to get from Earth to Mars?

46. Why did Venus have to get an air conditioner? Answer: Because Mercury moved in.

47. Why did the cow become an astronaut? 

48. Why did all the pecans go to space? 

49. Which reindeer loves to go to outer space?

50. Which one of Santa’s reindeer can you see in outer space?

The most widely accepted cosmological model is that of the Big Bang. This has been proven since the discovery of cosmic microwave background radiation or CMBR. Although, strictly speaking, no one knows exactly what ‘banged’, we know from extrapolation that the Universe was infinitely hot at birth, cooling down as it expanded.

Even only within minutes of expansion, scientists predict its temperature to have been about a billion Kelvin. Moving backwards to 1 second, it is said to have been at 10 billion Kelvin. For comparison, today’s universe is found to have an average temperature of only 2.725 Kelvin.

2. It will be cold when it grows old

Observations made especially on galaxies farthest from us show that the Universe is expanding at an accelerated rate. This, and data that show that the Universe is cooling allows us to believe that the most probable ending for our universe is that of a Big Freeze.

That is, it will be devoid of any usable heat (energy). It is due to this prediction that the Big Freeze is also known as the Heat Death. Accurate measurements made by the Wilkinson Microwave Anisotropy Probe (WMAP) on the current geometry and density of the Universe favour such an ending.

Current estimates with regards to the size of the Universe pegs it at a width of 150 billion light years. Although it may seem peculiarly inconsistent with the age of the Universe, which you’ll read about next, this value is easily understood once you consider the fact that the Universe is expanding at an accelerated rate.

4. The Universe is 13.7 billion years old

If you think that is amazing, perhaps equally remarkable is the fact that we know this to better than 1% precision. Credit goes to the WMAP team for gathering all the information needed to come up with this number. The information is based on measurements made on the CMBR.

Older methods that have contributed to confirming this value include measurements of the abundances of certain radioactive nuclei. Observations made on globular clusters, which contain the oldest stars, have also pointed to values close to this.

Based on Einstein’s Theory of General Relativity, there are three possible shapes that the Universe may take: open, closed, and flat. Once again, measurements by WMAP on the CMBR have revealed a monumental confirmation – the Universe is flat.

Combining this geometry and the idea of an invisible entity known as dark energy coincides with the widely accepted ultimate fate of our universe, which as stated earlier, is a Big Freeze.

Considering only the largest structures, the Universe is made up of filaments, voids, superclusters, and galaxy groups and clusters. By combining galaxy groups and clusters, we come up with superclusters. Some superclusters in turn form part of walls, which are also parts of filaments.

The vast empty spaces are known as voids. That the Universe is clumped together in certain parts and empty in others is consistent with measurements of the CMBR that show slight variations in temperature during its earliest stages of development.

7. A huge chunk of it is made up of things we can’t see

Different wavelengths in the electromagnetic spectrum such as those of radio waves, infrared, x-rays, and visible light have allowed us to peer into the cosmos and ‘see’ huge portions of it. Unfortunately, an even larger portion cannot be seen by any of these frequencies.

And yet, certain phenomena such as gravitational lensing, temperature distributions, orbital velocities and rotational speeds of galaxies, and all others that are evidence of a missing mass justify their probable existence. Specifically, these observations show that dark matter exists. Another invisible entity known as dark energy, is believed to be the reason why galaxies are speeding away at an accelerated rate.

Nope. The Earth is not the centre of the Universe. It’s not even the centre of the galaxy. And no again, our galaxy is not the entire universe, neither is it the center. Don’t hold your breath but the Universe has no center. Every galaxy is expanding away from one another.

The members that we are talking about are the galaxies. As mentioned earlier, they are rushing away from each other at increasing rates. In fact, before the findings of most recently gathered data, it was believed that the Universe might end in a Big Rip. That is, everything, down to the atoms, would be ripped apart.

This idea stemmed from this observed accelerated rate of expansion. Scientists who supported this radically catastrophic ending believed that this kind of expansion would go on forever, and thus would force everything to be ripped apart.

10. To gain a deeper understanding of it, we need to study structures smaller than the atom

Ever since cosmologists started to trace events backwards in time based on the Big Bang model, their views, which focused only on the very large, got smaller and smaller. They knew, that by extrapolating backwards, they would be led into a universe that was very hot, very dense, very tiny, and governed by extremely high energies.

These conditions were definitely within the realm of particle physics, or the study of the very small. Hence, the most recent studies of both cosmology and particle physics saw an inevitable marriage between the two.