Planet has most in solar system after 12 discovered

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There’s a new moon king in our solar system, as 12 new moons were discovered around Jupiter have made it the planet with the most moons.

Jupiter is already the biggest planet in our solar system, but it previously had the second-most moons with 80, trailing only Saturn with 83.

Astronomers using telescopes in Hawaii and Chile in 2021 and 2022 were able to spot the newly discovered moons and report them to the International Astronomical Union’s Minor Planet Center. Astronomers then followed up the observations to make sure the moons orbit the planet, which was recently confirmed.

Scott Sheppard of the Carnegie Institution for Science, who was part of the discovery team, posted the findings online.

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What are Jupiter’s newly discovered moons like?

Sheppard told the Associated Press the moons range in size from 0.6 miles to 2 miles, but only half of them are big enough – at least one mile – to have a name.

The moons also take a much longer time than ours to orbit its planet. Sky and Telescope reported all of the newly discovered moons take more than 340 days to orbit Jupiter, and nine of them take at least 550 days. By comparison, our moon takes about 27 days to orbit Earth, NASA says.

How many moons does each planet have?

The newly discovered moons give Jupiter 92 total moons, the most out of any planet in the solar system. Counting the new moons, here’s how many moons each planet has, according to NASA (which has not officially recognized the new Jupiter moons):

Mercury: 0
Venus: 0
Earth: 1
Mars: 2
Jupiter: 92
Saturn: 83
Uranus: 27
Neptune: 14

Sheppard, who has been part of past moon observations on Jupiter and Saturn, believes there are moons orbiting Jupiter and Saturn that haven’t been discovered yet. He said both planets have small moons believed to once be bigger moons that collided with space debris like asteroids.

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Missions to Jupiter moons

The confirmed discovery of the moons comes as space agencies are prepping to observe the planet and its moons.

The European Space Agency will be launching its Jupiter Icy Moons Explorer, Juice, in April to observe the planet and its three large ocean-bearing moons – Ganymede, Callisto and Europa – with the goal to characterize the moons “as both planetary objects and possible habitats.”

In October 2024, NASA plans to send its Europa Clipper orbiter to observe the planet and its moon, Europa. The moon is believed to be mostly water ice and have twice as much water as Earth, with evidence an ocean of water or slushy ice lies beneath the surface. The goal will be to see if the Europa could be suitable for life.

Contributing: Marcia Dunn, Associated Press

Follow Jordan Mendoza on Twitter: @jordan_mendoza5.

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