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    Ganymede. It's bigger than Mercury, has a liquid iron core and is the only moon in the Solar System with its own magnetic field. The terrain is varied, but there are broadly two different types: heavily-cratered dark regions (evidence of great age) and brighter regions showing patterns of ridges and grooves for thousands of miles, suggesting later geological activity, but nonetheless ancient. ©Mona Evans,"Jupiter's Galilean Moons" www.bellaonline.c...

    Ganymede A satellite of Jupiter and the largest moon in the Solar System. It is the seventh moon and third Galilean satellite outward from Jupiter. Completing an orbit in roughly seven days, Ganymede participates in a 1:2:4 orbital resonance with the moons Europa and Io, respectively.

    Ganymede, the third moon of Jupiter

    Jupiter's Io, taken by the Galileo spacecraft

    Ganymede. One of Jupiter's Moons.

    The moons of the solar system

    The Eridanus Void. This area shows almost no signs of cosmic matter, meaning no stars, planets, solar systems or clouds of cosmic dust. Researchers couldn't even find dark matter, which is invisible but measurable by its gravitational pull. There were also no signs of black holes that might have gobbled up the matter once present in the region.

    The speckled object depicted here is Callisto, Jupiter’s second largest moon. This image was taken in May 2001 by NASA’s Galileo spacecraft, which studied Jupiter and its moons from 1995 until 2003.

    Neptune is the eight and the last planet of our solar system (Pluto has been demoted to a dwarf planet). It is slightly more massive than its near-twin Uranus. Neptune has 13 known moons and a planetary ring system. Image Source: NASA

    Triton is, with a diameter of 2,700 km, the largest of Neptune’s 13 moons. It is the only large moon in the Solar System with a retrograde orbit (an orbit in the opposite direction to its planet’s rotation), which cannot have formed out of the same region as Neptune, so it must have been captured from elsewhere. Because of its retrograde orbit and composition similar to Pluto’s, Triton is thought to have been captured from the Kuiper belt.

    Jupiter-Mass one-thousandth that of the Sun but is two and a half times the mass of all the other planets in our Solar System combined. Jupiter is classified as a gas giant along with Saturn, Uranus and Neptune. Together, these four planets are sometimes referred to as the Jovian or outer planets.

    Io, Jupiter's moon

    #Venus

    Jupiter Moons - Callisto discovered by Galileo Galilei in 1610 using a telescope. It is thought to have oceans of liquid water beneath its crust. about the size of Mercury, is the 3rd largest moon in the solar system. It is more heavily cratered than any other moon in the solar system. Callisto remains as it was when it formed, during the period of intense meteoroid bombardment that the entire solar system experienced

    Mercury, Venus, Earth, The Moon (Luna), Mars, Jupiter, Io, Europa, Ganymede, Callisto, Saturn, Enceladus, Titan, Iapetus, Hyperion, Uranus, Miranda, Neptune or Triton #Astronomy

    Jupiter's moon, Io, the most volcanic body in the solar system, is seen in this composite image obtained by NASA's Galileo spacecraft in 1996. The smallest features that can be discerned are 2.5 kilometers in size.

    Jupiter's moons

    From : wikipedia - * Callisto * - Callisto is another of Jupiter's moons and one of the four Galilean moons. It is the third-largest moon in the Solar System and the second-largest in the Jovian system, after Ganymede -

    Sun with Solar Flare. This week the Sun gave up its strongest solar flare so far in 2013, accompanied by a coronal mass ejection (CME) headed toward planet Earth. A false-color composite image in extreme ultraviolet light from the Solar Dynamics Observatory captures the moment, recorded on April 11 at 0711 UTC. The flash, a moderate, M6.5 class flare erupting from active region AR 11719, is near the center of the solar disk.