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The basic idea is that the Solar System was originally a cloud of mostly gas and dust, with small amounts of refractory materials.Close to the Sun, the heat of the Sun vaporized dust particles and prevented the resulting gas from condensing; all that was left was the residual refractory materials.That makes sense for several reasons, especially if one considers the overall composition of the planet.
The overall density of these moons is therefore lower than that of terrestrial bodies in the inner reaches of the Solar System: The Galilean moons have long served as outposts for scientists and explorers in science fiction. Clarke's book (and movie) 2010, for example, after the monoliths have turned Jupiter into a low-luminosity star by waving their magic wands, they tell humanity that "all these worlds (the Galilean moons) are yours, except Europa." Europa, in these books, has a native ecosystem the monoliths wish to protect.
So, why have I classified them as hostile to stranded spacemen? Its surface is covered with sulfer-rich material emitted from many calderas and vents.
Finally, three more large moons: Titan and Triton in the upper row, and, at lower left, the Earth's Moon.
Last of all, at lower right, is Ceres, the largest asteroid.
It doesn't really belong here, but I include it so that you can see how it (and smaller asteroids) compare in size to the big boys.
Venus is NOT a good place to crash-land your spaceship. Well, the main problem is its very, very thick atmosphere.It acts like the translucent panels of glass in a greenhouse: Note that the surface temperature of Venus, over 700 Celsius, is hot enough to melt lead, tin, zinc, and other metals.It would be very difficult to keep any spaceship cool enough for its electronics to function for very long.) study guide part 1 answer key study guide part 2 answer key Homework: Study for Friday’s test!!This test covers everything we have learned this year!First, we have the really big ones: clockwise from upper left, Earth, Mercury, Mars and Venus.Next, the four large moons of Jupiter: clockwise from upper left, Io, Europa, Callisto, Ganymede.Could that explain the enormous difference in temperature?No, the reason that Venus is so much hotter than the Earth is that its thick atmosphere traps much of the heat: it transmits much of the visible and near-infrared light from the Sun down to the surface, but then absorbs the mid-infrared radiation emitted by the surface.These are the CR options for our Test on Friday Unit 1 Constructed Response possibilities Have a great evening, Mr. Today we discussed what planetary characteristics are required for life as we know it. We watched a Brainpop on galaxies then took some notes in our IANs detailing the differences between the 3 main types of galaxies. Yesterday we took a look at some evidence of the Big Bang theory and investigated our place in space.We then created our own creatures based hypothetical life requirements. Homework: Remember your textbook for class tomorrow! Homework: History of the Universe reading (if you didn’t finish in class). Today the students read a brief summery of different scientific theories relating to the origins of the universe!