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Discovered by:Mars has been observed by humans since ancient times, but the first formal record of its telescopic observation was in 1610Galileo Galilei.

Important facts:Mars has a thin atmosphere composed primarily of carbon dioxide, nitrogen, and argon.

how long does an hour or a year last:On Mars, it lasts approximately 24 hours and 39 minutes, which is almost 1 hour longer than a day on Earth. A year on Mars, however, is much longer, lasting about 687 Earth days.

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Discovered by:Galilei made the first accurate observation of Venus in 1610. He observed the planet through a telescope and discovered its phases.

Important facts:Venus is the second hottest planet in our solar system.

how long does an hour or a year last:On Venus, a day lasts 243 Earth days, while a year lasts 225 Earth days. This means that on Venus, a day is longer than a year.

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Discovered by:Saturn wasn't "discovered" at a specific time, as one might say about the "invention" of a new instrument. As a celestial body visible to the naked eye, Saturn has been known and observed by various cultures since ancient times

Important facts:
Saturn is a gas giant, like Jupiter, composed primarily of hydrogen and helium.

how long does an hour or a year last:En Saturno, un día dura aproximadamente 10 horas y 33 minutos. Un año, por otro lado, dura 29 años y 167 días en la Tierra.

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Discovered by:Johnson Space Center. On the night of September 23-24, 1846, astronomers discovered Neptune, the eighth planet in orbit around the Sun.

Important facts:Neptune, the last planet in our solar system, is a dark, cold, and very windy ice giant, which is the farthest from the Sun.

how long does an hour or a year last:On Neptune, a day (or rotation period) lasts approximately 16 hours, while a year (or orbital period around the Sun) lasts about 165 Earth years.