13 Does Venus fall in the habitable zone? If Venus' greenhouse effect could be reversed by some means, can it become habitable based on its current distance from the Sun?

14 How can you describe the biggest star in the Milky Way?

15 If a planet could successfully orbit a black hole without being harmed, what would the sky look like from its surface?

16 Would we be dead if Jupiter didn't exist?

17 Is Betelgeuse still the largest star ever recorded?

18 Why doesn't NASA launch something into a black hole, so that it can send reports back before being swallowed up?

19 If Earth got flung out of the solar system and became a rogue planet, what measures would we take to survive, whether or not those would actually succeed?

20 How many Milky Way-sized galaxies can fit between us and Andromeda?

21 Why was it so difficult to figure out the form of the Milky Way?

22 Why did the scientists decide 1 parsec to be 3.26 light years? Why not 5 or 10 or some other more sensible number?

23 What would happen if we nuked the Sun?

24 Are there any planets where gravity is so low that we could flap our hands to fly?

25 Why doesn't my laser pointer make a red dot on the moon?

26 When Betelgeuse explodes, is it really the end of mankind?

27 How can humanity save itself when our Sun becomes a red giant star and possibly even engulf and destroy the Earth?

28 Is it possible, in the near future, that NASA will be able to send missions to Alpha Centauri?

29 How exactly does Jupiter protect the Earth when they are so far away from each other?

30 If Alpha Centauri A replaced our Sun, would the Earth still be in the habitable zone?

31 Is it possible for a star to orbit a planet? Has it ever been observed?

32 How big would Betelgeuse appear to us if we replaced the Sun with it?

33 If there was a black hole the size of 1 googolplex meters on Earth, what would happen?

34 Does the Sun rotate? If so, how long does it take to rotate all the way around? How long is a "day" for the Sun?

35 I just learned that The Moon continues to spin away from the Earth, at the rate of 3.78cm (1.48in) per year. How do scientists measure such a small unit across such a large space?

36 How do you know where a black hole is supposed to take you?

37 How does the Moon reflect light so evenly? Shouldn’t the edges curving away from us reflect less light down to Earth and so appear duller?

38 Can we keep our Sun alive by taking already fused helium out and giving it more hydrogen to fuse?

39 What would an alien civilization see if they looked at our solar system?

40 What is the largest and closest the moon could be, without it being torn apart, such that it creates the largest image in the sky?

41 How do space telescopes keep their lenses clean?

42 When will planet Earth start and end?

43 Was it ever proven that there was a sun inside the Earth?

44 What would happen if we brought one cubic meter of matter from a neutron star to Earth?

45 If there is no atmosphere on the moon, can you put a satellite to orbit it only as high as 100 feet from the moon?

46 What is the brightest star in the Universe?

47 Is Mars too small to have a permanent atmosphere?

48 Is there water in mars?

49 What would be the size of the mirror of a space telescope to observe the planets of Alpha Centauri with a level of detail close to Mars seen from the Earth?

50 How many millions of year will it take for the Milky Way and Andromeda to collide and merge until they become one Galaxy?

51 Why are the rings of Saturn so thin?

52 What is the significance of NASA's Feb 22, 2017 announcement about the discovery of 7 Earth-like planets orbiting TRAPPIST-1?

53 Does the North Star have a solar system?

54 How was it concluded that Jupiter and Saturn are gaseous planets and they have no surface (when we couldn't enter into their atmosphere still)?

55 If the Hubble could take such great pictures from Earth's orbit of distant stars, why can't we send probes to relatively nearby stars, and capture much closer images of other solar systems and exoplanets?

56 Is it true that all of our planet's gold came from a supernova explosion billions of years ago? If so, how do scientists know this to be true?

57 How would you describe Earth, if it was a Type IV civilization on the Kardashev Scale?

58 What is the biggest planet/star in the universe?

59 What would happen if an asteroid hit the Sun?

60 Since all motion is relative, why is it wrong to say that the Sun revolves around the Earth?

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