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Q: Which is the first planet discovered with the aid of a telescope?
  • A. Jupiter
  • B. Neptune
  • C. Uranus
  • D. Mars
Correct Answer: Option C - Uranus, the seventh planet from the Sun, was discovered in 1781, It was also the first planet to be discovered using a telescope, as Mercury, Venus, Mars, Jupiter and Saturn were all bright enough to be easily visible to the naked eye.
C. Uranus, the seventh planet from the Sun, was discovered in 1781, It was also the first planet to be discovered using a telescope, as Mercury, Venus, Mars, Jupiter and Saturn were all bright enough to be easily visible to the naked eye.

Explanations:

Uranus, the seventh planet from the Sun, was discovered in 1781, It was also the first planet to be discovered using a telescope, as Mercury, Venus, Mars, Jupiter and Saturn were all bright enough to be easily visible to the naked eye.