Here are the answers to your questions:
Question 1: Why is Jupiter classified as a gas giant?
C. It has no solid surface and is made mostly of gas.
Jupiter is composed primarily of hydrogen and helium, and it lacks a well-defined solid surface, which is a key characteristic of gas giants.
Question 2: What keeps the planets in orbit around the sun?
C. Gravity.
Gravity is the force that attracts the planets toward the Sun, keeping them in orbit.
Question 3: What is a key difference between asteroids and comets?
C. Comets are icy and develop tails near the Sun.
Comets contain significant amounts of ice and gas, resulting in the formation of tails when they approach the Sun, while asteroids are primarily rocky or metallic.
Question 4: In 1-2 sentences, explain how gravity affects the motion of planets and moons in the solar system.
Gravity acts as the fundamental force that governs the motion of planets and moons, pulling them towards larger bodies like the Sun or planets and keeping them in stable orbits. The gravitational attraction ensures that these celestial bodies also maintain predictable paths around their respective orbits.
Question 5: Why are the outer planets not likely to support life as we know it?
The outer planets, such as Jupiter and Saturn, are made mostly of gas and have extreme atmospheric conditions, high radiation levels, and low temperatures, which make it difficult for life as we know it, which relies on stable, solid surfaces and certain temperature ranges, to exist. Additionally, the lack of a solid surface and harsh environments present challenges for the development and sustainability of life forms.