The Fourth planet from the sun in the solar system is

Analyze the question: You are asked to identify the planet that is fourth in position from the sun.

Explain the concept: The planets of the solar system are arranged by their distance from the sun. A common way to remember the order is the mnemonic:

"My Very Educated Mother Just Served Us Noodles"

| Position | Planet | Mnemonic word | |---|---|---| | 1st | Mercury | My | | 2nd | Venus | Very | | 3rd | Earth | Educated | | 4th | Mars | Mother | | 5th | Jupiter | Just | | 6th | Saturn | Served | | 7th | Uranus | Us | | 8th | Neptune | Noodles |

Solution:

• Mercury is 1st, so option A is wrong.
• Uranus is 7th, so option B is wrong.
• Neptune is 8th, so option C is wrong.
• Mars is 4th, which matches the question.

Answer: The fourth planet from the sun is Mars, option D.

Tip: Remember the inner (terrestrial) planets as Mercury, Venus, Earth, Mars, and the outer planets as Jupiter, Saturn, Uranus, Neptune. Mars is the last of the rocky inner planets, and the asteroid belt lies just after it. Mars is also called the "Red Planet" because of the iron oxide on its surface, which is a fact that often appears in exams.