Level 1
What is Sun?
The star in the center of our solar system. And it gives off energy as light.
What is Solar system?
The sun and all the objects that orbit around it.
What is Star?
A very large ball of bright glowing hot matter in space.
What is planet?
A large object that orbits a star.
What is extrasolar planet?
A natural planet in a planetary system outside our own solar system.
What is atmosphere?
The layer of gases around the earth.
What is troposphere?
The lowest part of Earth's atmosphere.
What is Moon?
A natural satellite in the most common usage, an astronomical body thayt orbits a planet or minor planet.
What is Asteroid?
A minor planet, especially of the inner solar system.
What is Comet?
An icy, small solar system body that, when passing close to the sun, warms and begins to release gases.
What is terrestrial planet?
A planet that is composed primarily of silicate rocks or metals.
What is a giant planet?
Any planet much larger than Earth and usually composed of low-boiling-point materials gases or ice.
What is a gas giant?
A giat planet composed mainly of hydrogen and helium.
What is Mars?
A fourth planet from the sun.
What is Venus?
A second planet from the sun.
What is Mercury?
The smallest and innermost planet in the solar system.
What is Saturn?
The sixth planet from the sun.
What is Uranus?
The seventh planet from the sun.
What is Neptune?
The eighth and farthest known planet from the sun.
What is Pluto?
An icy dwarf planet in the Kuiper belt, a ring of bodies beyond the orbit of Neptune.
What is minor planet?
An astronomical object i direct orbit around the sun that is neither a planet nor exclusively classified as a comet.
What is Planetary ring system?
A ring system around a planet is also known as a planetary ring system.
What is Centaur?
Small Solar system bodies with either a perihelion or a semi-major axis betweenthose of the outer planets.
What is Heliosphere?
The vast, bubble-like region of space which surrounds and is created by the Sun. In plasma physics terms, this is the cavity formed by the Sun in the surrounding interstellar medium.
What is asteroid belt?
A torus-shaped region in the Solar System, located roughly between the orbits of the planets Jupiter and Mars, that is occupied by a great many solid, irregularly shaped bodies, of many sizes but much smaller than planets, called asteroids or minor planets.