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Enceladus was discovered on August 28, 1789, by William Herschel, [1] [17] [18] but little was known about it until the two Voyager spacecrafts, Voyager 1 and Voyager 2, flew by Saturn in 1980 and 1981. [19] In 2005, the spacecraft Cassini started multiple close flybys of Enceladus, revealing its surface and environment in greater detail.
Enceladus' south pole, captured by NASA's Cassini-Huygens spacecraft, 2015. The Enceladus Orbilander is a proposed NASA Flagship mission to Saturn's moon Enceladus.The Enceladus Orbilander would spend a year and a half orbiting Enceladus and sampling its water plumes, which stretch into space, before landing on the surface for a two-year mission to study materials for evidence of life. [1]
True polar wander is a solid-body rotation (or reorientation) of a planet or moon with respect to its spin axis, causing the geographic locations of the north and south poles to change, or "wander". In rotational equilibrium, a planetary body has the largest moment of inertia axis aligned with the spin axis, with the smaller two moments of ...
Exobiology Extant Life Surveyor, (also called EELS) [1] is a snakebot vehicle originally designed to explore the surface and the oceans of Enceladus, a moon of Saturn. [2] The JPL has also referred to the possibility of using EELS to explore locations such as lunar lava tubes, [1] [3] Mars's polar caps, and Earth's ice sheets.
Here, the ratio of the rotation period of a body to its own orbital period is some simple fraction different from 1:1. A well known case is the rotation of Mercury, which is locked to its own orbit around the Sun in a 3:2 resonance. [2] This results in the rotation speed roughly matching the orbital speed around perihelion. [14]
Former Senate Republican Leader Mitch McConnell (Ky.) said he had “candid” conversations with President Trump when asked about reports that he and Trump got into “screaming matches” during ...
The geographic poles are defined by the points on the surface of Earth that are intersected by the axis of rotation. The pole shift hypothesis describes a change in location of these poles with respect to the underlying surface – a phenomenon distinct from the changes in axial orientation with respect to the plane of the ecliptic that are caused by precession and nutation, and is an ...
While humans wouldn’t be very happy to find that organisms were growing on their skin, particularly fungi, algae, and insects, it works out pretty well for sloths. Sloths may be hosting entire ...