Solar System

2019 October 17

Moons of Saturn Image Credit: Cassini Imaging Team, SSI, JPL, NASA

Explanation: On July 29, 2011 the Cassini spacecraft’s narrow-angle camera took this snapshot and captured 5 of Saturn’s moons, from just above the ringplane. Left to right are small moons Janus and Pandora respectively 179 and 81 kilometers across, shiny 504 kilometer diameter Enceladus, and Mimas, 396 kilometers across, seen just next to Rhea. Cut off by the right edge of the frame, Rhea is Saturn’s second largest moon at 1,528 kilometers across. So how many moons does Saturn have? Twenty new found outer satellites bring its total to 82 known moons, and since Jupiter’s moon total stands at 79, Saturn is the Solar System’s new moon king. The newly announced Saturnian satellites are all very small, 5 kilometers or so in diameter, and most are in retrograde orbits inclined to Saturn’s ringplane. You can help name Saturn’s new moons, but you should understand the rules. Hint: A knowledge of Norse, Inuit, and Gallic mythology will help.

∞ Source: apod.nasa.gov/apod/ap191017.html

Neptune ♡

This color image, produced from a distance of about 16 million kilometers, shows several complex and puzzling atmospheric features. Credit: NASA/JPL

The Big Dipper

by: VegaStar Carpentier

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In early 2001 during a launch of Atlantis, the Sun, Earth, Moon, and rocket were all properly aligned for this photogenic coincidence.

Image Credit: Pat McCracken, NASA

Comet Lovejoy (C/2014 Q2) by: Troy Casswell

Crescent Moon and Earth’s Atmosphere Seen by International Space Station

Credit: NASA

Mimas (moon of Saturn) taken by the Cassini spacecraft.

Credit: NASA/JPL