asteroid: Rocky objects that orbit the Sun. Most asteroids orbit the region between the orbits of Mars and Jupiter, an area astronomers call the asteroid belt.
astronomyThe branch of science that deals with celestial bodies, space, and the physical universe. People who work in this field are called astronomers.
Basin: (geology) A low-lying area, often below sea level, where water collects and deposits fine silt and other sediments at the bottom. Because these materials collect there, they are sometimes called watersheds or drainage basins.
Computer model: A program that runs on a computer and creates a model or simulation of a real-world feature, phenomenon, or event.
core: The center of an object, usually round in shape. (geology) The innermost layer of the Earth; or a long, tubular sample obtained by drilling into ice, soil, or rock. Scientists use cores to examine layers of sediment, dissolved chemicals, rocks, and fossils to learn how the environment of a place has changed over hundreds or thousands of years or longer.
Dwarf planet: A small body in the solar system. Like true planets, they orbit the Sun. However, dwarf planets are too small to be considered true planets. The most prominent of these bodies are Pluto and Ceres.
equator: An imaginary line around the Earth that divides it into the Northern and Southern Hemispheres.
gravityThe force that attracts anything with mass or volume to anything with mass. The greater the mass, the greater the gravitational force.
liquidA substance that flows freely but has a constant volume, such as water or oil.
Moon: Pertaining to the Earth's Moon.
Month: A natural satellite of every planet.
nitrogen: A colorless, odorless, non-reactive gaseous element that makes up about 78% of the Earth's atmosphere. Its scientific symbol is N. Nitrogen is released in the form of nitrogen oxides when fossil fuels are burned. Nitrogen exists in two stable forms. Both have 14 protons in their nuclei. However, one has 14 neutrons in its nucleus and the other has 15 neutrons. This difference is why they are called nitrogen-14 and nitrogen-15 (or nitrogen-15), respectively. 14N and 15N).
Orbit: The curved orbit of a celestial body or spacecraft around a galaxy, star, planet, or moon. One complete revolution around a celestial body.
planetThey are large celestial bodies that orbit stars, but unlike stars, they do not produce any visible light.
Pluto: A distant world located in the Kuiper Belt, just outside Neptune. Known as a dwarf planet, Pluto is the ninth-largest body orbiting the Sun.
very: (in Earth sciences and astronomy) The cold regions of Earth farthest from the equator; the upper and lower ends of the imaginary axis about which the heavens rotate.
leftovers: something that remains from another part of something, another time, or some characteristic of an earlier species.
scenario: A possible (or likely) sequence of events and how it might unfold.
solid: It is solid and stable in shape and is neither a liquid nor a gas.
Source: www.snexplores.org
