Black Holes: Black holes form from a red star that collapses on itself. They are 10 to 15 times more massive than the sun. Its gravitational pull is so great that even light cannot escape. For something to get sucked into one it has to pass the Schwarzschild radius. Once it passes this point, you cannot escape.
Mars: Mars is the 4th planet from the sun. Its atmosphere consists of mostly carbon dioxide. It has two moons named Diemos and Phobos. At a certain time of year Mars seems to exhibit retrograde motion from Earth's point of view. At one point people thought there might be a possibility that humans could live on mars but it gets to outrageous temperatures.
Pluto: It is debatable if pluto is a planet or not. It actually is classified as a dwarf planet which means it has not cleared it's orbit. Pluto is small and rocky and comes just after Neptune. It is so cold on Pluto that nitrogen and oxygen becomes frozen. It is two-thirds the size of our moon, but is the largest object in the Kuiper Belt.
Asteriod Belt: The asteriod belt comes right after Mars but right before Jupiter. THe asteriod belt consists or, yes, asteriods! Asteriods are chunks of rocks, that sometimes can be metals. Every now and then an asteriod come into Earth's atmosphere and strikes Earth's surface. Some don't even reach the surface, they can burn up because of how fast they come towards Earth.
Milky Way Galaxy: The milky way galaxy consists of Mercury, Venus, Earth, Mars, Asteriod Belt, Jupiter, Saturn, Uranus, Neptune, Pluto, then the Oot Cloud. We, obviously, live in the milky way galaxy. It is about 13 billion years old.
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