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Whether Ganymede has an ionosphere associated with its atmosphere is unresolved. [24] Ganymede's surface is composed of two main types of terrain, the first of which are lighter regions, generally crosscut by extensive grooves and ridges, dating from slightly less than 4 billion years ago, covering two-thirds of Ganymede.
Io has an extremely thin atmosphere made up mostly of sulfur dioxide (SO 2). [29] If a surface data or collection vessel were to land on Io in the future, it would have to be extremely tough (similar to the tank-like bodies of the Soviet Venera landers) to survive the radiation and magnetic fields that originate from Jupiter. [30]
The following is a list of stars with resolved images, that is, stars whose images have been resolved beyond a point source. Aside from the Sun , observed from Earth , stars are exceedingly small in apparent size, requiring the use of special high-resolution equipment and techniques to image.
The mixture of chemicals that make up the frozen surfaces on two of Jupiter’s largest moons have been revealed in the most detailed images of them ever taken by a telescope on Earth.
This is Hubble's image of a star nursery in the Carina Nebula The star-forming region NGC 3324 in the Carina Nebula, captured by Hubble. NASA, ESA, and The Hubble Heritage Team (STScI/AURA)
Image of the Sun's cell-like surface structures. The visible surface of the Sun, the photosphere, is the layer below which the Sun becomes opaque to visible light. [77] Photons produced in this layer escape the Sun through the transparent solar atmosphere above it and become solar radiation, sunlight.
The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not necessarily in the public domain. Materials based on Hubble Space Telescope data may be copyrighted if they are not explicitly produced by the STScI. See also {{PD-Hubble}} and {{Cc-Hubble}}.
The size of solid bodies does not include an object's atmosphere. For example, Titan looks bigger than Ganymede, but its solid body is smaller. For the giant planets, the "radius" is defined as the distance from the center at which the atmosphere reaches 1 bar of atmospheric pressure. [11]