The second picture is of Jupiter, the behemoth of the solar system.
While checking up on Jupiter, I learned a rather funny fact about the Trojan asteroids. The Trojan asteroids are two groups of asteroids that are caught by gravity at Jupiter's L4 and L5 Lagrange points. This means they orbit the Sun roughly 60 degrees ahead of and behind Jupiter in its orbit. I had never known why they were called the Trojan asteroids before, but it turns out it's because the first one discovered was called Achilles, and by convention every one discovered since (all 4,076 of them) have been named after figures in the Trojan War from the Iliad. In fact, it's even more structured than that; the asteroids orbiting ahead of Jupiter are named after people in the Greek camp, while those following Jupiter are named after people in the Trojan camp (although this rule was suggested after they'd found a few, so there are two exceptions: Patroclus is found in the Trojan camp, and Hektor, the largest of them, in the Greek camp).
As an interesting aside, the word trojan has now entered the astronomical lexicon to refer to any body trapped 60 degrees ahead or or behind another in its orbit. Thus, there are other trojan asteroids (note the lowercase spelling); several associated with Mars, and a few with Neptune. There are even 4 known trojan moons, all in orbit around Saturn, which is where three moons share the same orbit, one large one in the middle with two smaller flanking ones behind and before.
A hui hou!