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The plaque attached to Pioneer 10. The Pioneer plaques are a pair of gold - anodized aluminum plaques that were placed on board the 1972 Pioneer 10 and 1973 Pioneer 11 spacecraft, featuring a pictorial message, in case either Pioneer 10 or 11 is intercepted by intelligent extraterrestrial life. The plaques show the nude figures of a human male ...
Twinkling, also called scintillation, is a generic term for variations in apparent brightness, colour, or position of a distant luminous object viewed through a medium. [1] If the object lies outside the Earth's atmosphere, as in the case of stars and planets, the phenomenon is termed astronomical scintillation; for objects within the ...
A poster of the planets and moons visited during the Voyager program. The Voyager program is an American scientific program that employs two interstellar probes , Voyager 1 and Voyager 2 . They were launched in 1977 to take advantage of a favorable alignment of the two gas giants Jupiter and Saturn and the ice giants, Uranus and Neptune, to fly ...
NASA Is Launching a Dazzling Star Into Space—and It's 100% Fake. Studying distant stars is difficult without absolute flux calibration points—stars that can help astronomers calibrate their ...
Among them is Ganymede, the largest and most massive moon in the Solar System. Its 87 known irregular moons are organized into two categories: prograde and retrograde. The prograde satellites consist of the Himalia group and three others in groups of one. The retrograde moons are grouped into the Carme, Ananke and Pasiphae groups.
v. t. e. A classical planet is an astronomical object that is visible to the naked eye and moves across the sky and its backdrop of fixed stars (the common stars which seem still in contrast to the planets). Visible to humans on Earth there are seven classical planets (the seven luminaries ).
Planetshine is the dim illumination, by sunlight reflected from a planet, of all or part of the otherwise dark side of any moon orbiting the body. Planetlight is the diffuse reflection of sunlight from a planet, whose albedo can be measured. The most observed and familiar example of planetshine is earthshine on the Moon, which is most visible ...
What today is known to be the Solar System was regarded for generations as the contents of the "whole universe". The most relevant phenomena of these kind are: Basic gravity. Following the trajectory of free falling objects, the Earth is "below" us and the sky is "above" us.