Earth and Space

Kepler's First Law

each planet's orbit around the Sun is an ellipse.

Nebula

a giant cloud of gas and dust from which everything in the solar system was formed.

Hydrothermal Vent

a volcanic opening in Earth's crust that pumps out clouds of sulphurous chemicals.

North Star

a celestial object that appears to change positions amongst the stars night by night.

Saturn's rings

made up of crystal ice.

Europa

one of Jupiter's moons with the greatest chance of harboring life.