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Outer Space ⁽⁶⁶⁾

Why is the sky dark if there are billions of stars in the Universe?

What is the fastest speed a spacecraft can achieve?

What would happen if Earth passed through a comet's tail?

What is ‘Grandfather Paradox’ concerning time travel and how can it be resolved?

How do scientists know that dark energy is speeding up the expansion of the universe?

Which is the most dangerous stage of a manned spaceflight?

What are gravitational waves? Do they really exist?

What is the chemical composition of the Sun? How do astronomers identify the types of elements it contains?

Why is Jupiter’s moon Europa believed to have life under its surface?

What type of physiological problems the astronauts undergo after spending a long period in the weightless condition?

What is the source of the Sun’s energy output?

What did the American astronauts leave behind on the Moon?

What kind of atmosphere does Mars have?

Why do stars have different colors?

How will the Universe end? Or will it go on expanding forever?

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