Describes the similarities and differences between Mercury and Venus, the two planets that are the closest to the Sun, comparing their surfaces, temperatures, atmospheres, rotation, gravity, and resul
Presents a study of the planets Uranus and Neptune, including information about their size, distance from the Sun, orbits, moons, and the gases that they are made of.
Describes the different methods used to explore and research outer space, including space telescopes and observatories, and explains how new technologies are uncovering more information on space throu
