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The orbit of the Earth around the Sun.
What is elliptical?
Jupiter, Neptune, Saturn, and Uranus have this in common.
What are the gas planets?
This causes the temperatures of the North and South Poles to remain cold during the year.
What is the tilt of the Earth's axis?
This is the correct order, from the Sun, of the inner planets.
What are Mercury, Venus, Earth, and Mars?
The Earth completes one of these on this.
What are rotation and axis?
A student saw a shooting star last night.
What is a meteor?
Craters last for millions of years on the Moon's surface because of this.
What is no wind or water to erode the craters?
This phase of the moon is the moon passing between the Earth and the Sun.
What is the New Moon?
This happens when the Moon and the Sun form almost a 90 degree angle with Earth.
What are low tides?
This part of the comet exists when the comet is close to the Sun and when the comet is far away from the Sun.
What is a dust tail?
Earth rotating on its axis helps keep the planet at proper temperatures for life because of this.
Mars and Saturn have different year lengths because of this.
What is because their revolutions around the Sun take different amounts of time?
An asteroid is this.
What is a rocky mass up to several hundred kilometers wide that revolves around the sun?
A meteor is this.
What is a meteoroid that hits the Earth's atmosphere?
A meteoroid is this.
What is a small asteroid?
A meteorite is this.
What is a meteoroid that strikes the Earth?
The names of the eight planets in order.
What are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune?
This was originally a planet counted in our Solar System, but now is known as a dwarf planet.
What is Pluto?
This was the name of the astronaut who landed on the moon.
Who was Neil Armstrong?
The Solar System is made of this.
What are the Sun, the planets, moons, and stars?
This is the only planet known to have life.
What is the Earth?
This is the group that studies the Solar System.
Who is NASA?
This is our galaxy.
What is the Milky Way?
What is a satellite?
This is the best class in the school.
Who is Mrs. Green's fifth grade class?