The force that attracts all objects towards each other.
An eruption of gas from the sun caused by sunspots interacting.
A diagram used to chart the temperature and apparent brightness of stars.
A region of the Solar System between mars and Jupiter filled with asteroids.
A giant ball of mostly hydrogen and helium gas undergoing nuclear fusion.
The average distance between Earth and the sun.
Mercury, Venus, Earth and Mars are small, rocky and close to the sun.
Where you Nincompoops live.
The idea that the moon formed from the collision of earth and another planets sized objects billions of years ago.
The"Red Planet" because of it's iron rich soils. Colder than Earth, but contains water and could support life someday.
Parts of the head of a comet.
Inner layer of the Sun's atmosphere.
Distance light travels in a year.
The process of building something up gradually by gathering smaller pieces.
Star classification running diagonally through the middle of an HR diagram.
These can be spiral, elliptical, or irregular in shape and are made up of billionsof Star systems.
The rock and ice clumping together as a planet first begins to form.
A star system with two stars orbiting each other.
The remains of a dead high mass star. Spinning ones are known as Pulsars.