Celestial Objects and Celestial Movement

° Celestial Objects

• Stars

- massive, luminous spheres of plasma held together by gravity.

• Planets

- celestial bodies orbiting a star, massive enough to be rounded by their own gravity

• Moons (Satellites)

- objects orbiting the planet

• Asteroids

- rocky bodies orbiting the sun

- found in asteroid belt

• Comets

- icy bodies that release gas or dust

- has a nucleus, coma, and sometimes a tail

- develop glowing tails when near the sun

• Meteoroids

- small particles from comes or asteroids

• Galaxies

- massive systern of stars, stellar remnants, interstellar gas, dust, and dark matter, bound together by gravity

• Nebulae

- clouds of gas and dust in space, often regions where new states are born

° Celestial movement

Rotation

- spinning of celestial body on its axis

Revolution

- orbit of celestial body around another

Orbital Eccentricity

- describes how ellipticals (oval) an orbit is