Answer: Mercury, Venus, Earth, Mars
Explanation: We need to list the four closest planets to the sun in our solar system.
These are:
Mercury; with an average distance of 0.39 AU
Venus; with an average distance of 0.72 AU
Earth, with an average distance of 1 AU
Mars, with an average distance of 1.5 AU
Where the unit AU, named Astronomical Unit, is equivalent to:
1 UA = 150 million kilometers approx.
