What is Ganymede?
Ganymede (Ganymede, ) is a satellite orbiting Jupiter with a revolution period of about 7 days. Sorted by Jupiter from near to far, it ranks seventh among all moons of Jupiter and third among Galileo satellites. It maintains a 1: 2: 4 orbital resonance relationship with Europa and Europa.
- Europa
- Between 400 BC and 360 BC (most likely in the summer of 364 BC), Gande in the Warring States Period of China had already discovered Europa, more than 2000 years before Galileo.
- On January 11, 1610,
- Track parameters:
- Planet: Jupiter
- Average radius: 1,070,400km (0.007155 AU)
- Eccentricity: 0.003
- Near arch point: 1,069,200km (0.007147 AU)
- Far arch point: 1,071,600km (0.007163 AU)
- Revolution cycle: about 7 days
- Rotating speed: average 10.880km / s
- Orbital inclination: 2.21 (Zodiac angle) 0.20 (Jupiter's equator angle)
- Physical properties:
- Average radius: 2,631.2km (0.413 times the Earth)
- Surface area: 87.000,000 square kilometers (0.12 times of the earth)
- Volume: 7.6 × 10¹ (0.0705 times of the earth)
- Mass: 1.4819 × 10²³ (0.025 times of the earth)
- Average density: 4g / cm
- Surface gravity: 1.428m / s
- Escape speed: 3km / s
- Rotation cycle: 7 days
- Shaft inclination: 0-0.33
- Albedo: 0.43 ± 0.02
- Surface temperature: maximum 122K average 99K minimum: 22k
- Apparent magnitude: 5 (oppositition)
- Atmospheric pressure: extremely small
- Atmospheric composition: oxygen, atomic oxygen, ozone
- Europa is the only satellite in the solar system with a magnetic circle.
- Io may be composed of the Jupiter Sub-Nebula--the gas and gas surrounding Jupiter after its formation.
- The first batch was Pioneer No. 10 and
- Galileo found that other planets also have satellites, confirming that Earth is not the only planet in the universe with satellites, and also proved that Nicholas Copernicus's heliocentric theory is correct.
- Using simple telescopes and independent research, Galileo gave people a good understanding of the solar system, galaxies, and the vast universe. The telescope he made has allowed people to observe space scenes that were previously difficult to observe, and has deepened people's understanding of the universe.