Multiple choice general knowledge science & technology

Explain why the Earth can be seen from the space by Astronauts.

  1. The Earth gives out its own light.

  2. The Earth's crust which produces heat and light energy allows itself to be visible in space.

  3. The Earth reflected light from the closest star to itself to the Astronauts' eyes.

  4. The Earth refracted light from the Sun to the Astronauts' eyes.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Earth is visible from space because it reflects sunlight - it doesn't produce its own light. The Sun is the closest star to Earth, and its light reflects off Earth's surface (oceans, land, clouds) back to observers. Option A is wrong because Earth doesn't generate light. Option B is incorrect - crust heat doesn't produce visible light. Option D uses 'refracted' incorrectly - reflection is the correct phenomenon.

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