inner planets

MARS

• definition: Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System after Mercury.
• in my own words: 2nd smallest planet

MERCURY

• definition: Mercury is the smallest and innermost planet in the Solar System. Its orbital period around the Sun of 87.97 days is the shortest of all the planets in the Solar System.
• definition: shortest orbital period around the sun

VENUS

• definition: Venus is the second planet from the Sun, orbiting it every 224.7 Earth days. It has the longest rotation period of any planet in the Solar System and rotates in the opposite direction to most other planets.
• in my own words: 2nd planet from the sun

ASTROIDS

• definition: Asteroids are minor planets, especially of the inner Solar System. Larger asteroids have also been called planetoids.
• in my own words: rocks floating in space