This keeps the moon in its orbit around Earth.
What is gravity?
Small bodies of ice, rock and dust.
What are comets?
Anything that has mass and takes up space.
What is matter?
Two or more atoms held together by chemical bonds.
What is a molecule?
The systematic practice of solving problems with designed solutions.
What is engineering?
This happens when the shadow of one celestial body falls on another.
What is an eclipse?
The distance that light travels in a vacuum in one year.
What is a light-year?
A measure of the amount of matter in an object.
What is mass?
The state of matter in which the volume and shape of a substance are fixed.
What is a solid?
Matter, energy, or information that enters a system.
What is input?
This is the path that a body follows as it travels around another body.
What is an orbit?
A large collection of stars, gas, and dust held together by gravity.
What is a galaxy?
A measure of the gravitational force on an object.
What is weight?
What is a compound?
A set of interacting parts that work together
What is a system?
The cloud of dust and gas from which the planets and sun formed.
What is the solar nebula?
This area includes space and all of the energy and matter within it.
What is the universe?
A measure of the amount of space an object takes up.
What is volume?
The state of matter that has a fixed volume, but can change shape.
What is a liquid?
Limitations that engineers face during the design process.
What are constraints?
The apparent shift in position of an object when it is viewed from different points.
What is parallax?
The force of attraction between objects due to their massses.
What is gravity?
The ratio of the mass of a substance to its volume.
What is density?
The total kinetic energy of all the particles in a substance.
What is thermal energy?
Design testing that is repeated many times.
What is iterative testing?