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J1407b's disk has a 4-million km (2.5-million mi)-wide gap between radii 0.396 to 0.421 AU (59.2 to 63.0 million km; 36.8 to 39.1 million mi), which is believed to have been created by a nearly-Earth-sized (<0.8 M 🜨) exomoon orbiting within that gap and clearing out material, in a similar fashion to the shepherd moons of Saturn's rings.
Sun–Earth L 2: NASA: Arrived at L 2 in November 2003 and departed April 2004. Gaia Space Observatory: Sun–Earth L 2: ESA: Launched 19 December 2013. [36] Operational as of 2020. [37] Chang'e 5-T1 Service Module: Earth–Moon L 2: CNSA: Launched on 23 October 2014, arrived at L 2 halo orbit on 13 January 2015. [2] Queqiao: Earth–Moon L 2: CNSA
A hexagonal cyclone in Saturn's north pole has been spotted since the passage of Voyager 1 and 2, and was first imaged by Cassini on January 3, 2009. [25] It is just under 24,000 km (15,000 mi) in diameter, with a depth of about 100 km (60 mi), and encircles the north pole of the ringed planet at roughly 78° N latitude.
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With an average orbital speed of 9.68 km/s, [6] it takes Saturn 10,759 Earth days (or about 29 + 1 ⁄ 2 years) [86] to finish one revolution around the Sun. [6] As a consequence, it forms a near 5:2 mean-motion resonance with Jupiter. [87] The elliptical orbit of Saturn is inclined 2.48° relative to the orbital plane of the Earth. [6]
Earth's atmosphere photographed from the International Space Station.The orange and green line of airglow is at roughly the altitude of the Kármán line. [1]The Kármán line (or von Kármán line / v ɒ n ˈ k ɑːr m ɑː n /) [2] is a conventional definition of the edge of space; it is widely but not universally accepted.
The Roche limit for a rigid spherical satellite is the distance, , from the primary at which the gravitational force on a test mass at the surface of the object is exactly equal to the tidal force pulling the mass away from the object: [3] [4]
Voyager 1 encountered Saturn in November 1980, with the closest approach on November 12, 1980, when the space probe came within 124,000 kilometres (77,000 mi) of Saturn's cloud-tops. The space probe's cameras detected complex structures in the rings of Saturn , and its remote sensing instruments studied the atmospheres of Saturn and its giant ...