The smallest planet in our solar system is Mercury, and the largest planet is Jupiter.

• Mercury: Mercury is the smallest of the eight planets in our solar system. It is a terrestrial planet, similar to Earth, but much smaller in size. It is often referred to as the “innermost planet” because it orbits the Sun closest to it.
• Jupiter: Jupiter is the largest planet in our solar system and is often referred to as a gas giant. It is a massive planet with a diameter more than 11 times that of Earth. Jupiter is primarily composed of hydrogen and helium and has a strong magnetic field.

The planet known as the “red planet” is Mars. Mars is often called the “Red Planet” due to its reddish appearance, which is caused by iron oxide (rust) on its surface. It is the fourth planet from the Sun and is a terrestrial planet with a thin atmosphere. Mars has been of great interest to scientists and space exploration missions due to the possibility of past or present microbial life and its potential for future human exploration.