Asphaug and Reufer used computer simulations to study the giant impact scenario, and they found that mergers of satellites the size of the Galilean moons
can liberate ice-rich spiral arms, mostly from the outer layers of the smaller of the colliding moons.
Ever since I have acquired Chris Marriott's commercially available software "SkyMap Lite" and saw that one could predict, by means of an animation, a transit of the shadow of one of Jupiter's Galilean moons
, the desire grew to actually observe such a transit.
Galileo was the first person to observe Jupiter's four largest moons--now called the Galilean moons
View the crescent moon, Galilean moons
of Jupiter and Gamma Andromeda during SkyWatch: Five Moons over Worcester.
Other highlights of the session included a long look at Aldebaran, the bright-red star that serves as the bull's-eye in the Taurus constellation, as well as the four Galilean moons
of Jupiter lined up in a neat row.
We require a 4x4 grid (the corner of a checkerboard will do) and twelve tiles on which are printed the words AI (the three-toed sloth), AS, IO (one of the Galilean moons
of Jupiter), IS, MA, MR, MS, OM (a Hindu mantra), OR, RA (the Egyptian sun god), RI (a Japanese measure of 2.
The Galilean moons
vary in size from just smaller than Earth's moon (Europa) to nearly as large as Mars (Ganymede).
Today, these four large satellites of Jupiter--the Galilean moons
Io, Europa, Ganymede, and Callisto--are becoming familiar faces in the firmament.
Alex Teachey (Columbia University) and collaborators used a powerful statistical method to examine a population of known Kepler exoplanets, quantifying how often massive moons, like the Galilean moons
of Jupiter, might exist.
The Galilean moons
- Io, Europa, Ganymede and Callisto - are just large enough to be seen through a pair of binoculars and are easily seen when using a telescope as four points of light around the disc of Jupiter.
JupiterMoons focuses on the four Galilean moons
, Io, Europa, Ganymede, and Callisto, while SaturnMoons features Titan, Rhea, Iapetus, Dione, Tethys, Enceladus, Mimas, Hyperion, and Phoebe (the latter a challenge even for large telescopes).
Jupiter's diverse Galilean moons
- volcanic Io, icy Europa and rock-ice Ganymede and Callisto - make the Jovian system a miniature solar system in its own right.
From 19h30 until O1h15 a steady flow of curious onlookers got to see the Moon and Jupiter with its Galilean moons
in Maphefo, the 8-inch Dobsonian.
Lo, Europa, Ganymede and Calisto orbit which planet?
So close to the star, the planets might experience huge tidal pulls, stretching and squeezing their interiors and spurring heating and even volcanism, similar to what we see on Jupiter's Galilean moons