Venus
In our Solar System, the most Earthlike planet is Venus: it’s very nearly the same size and mass as Earth, and it orbits in the Sun’s habitable zone.

With a radius of 2,106 miles, Mars is the seventh largest planet in our solar system and about half the diameter of Earth. Its surface gravity is 37.5 percent of Earth’s.

By comparison, Mars has a volume of 1.6318 x 1011 km3 (163 billion cubic kilometers) which is the equivalent of 0.151 Earths.

The similarities between the two planets are important to scientists because they could help them look for signs of ancient life on Mars. So, Nasa concludes that Mars did once look like Earth but that was likely to have been billions of years ago. Some water still exists on the surface of Mars but today in ice form.

Problem 8 – The Dwarf Planet Pluto is 1/3 the size of Mars. How large is Jupiter compared to Pluto? Answer: Jupiter = 1/11 Earth, Mars= 1/2 Earth, so Pluto= 1/3 x 1/2 = 1/6 Earth, and 1/66 Jupiter.

3,389.5 km
Mars/Radius

Since Mars has lower gravity, you would age faster, though the effect is incredibly slight. You’ll probably “age” slower, as in you’ll experience the ails of aging less due to lower gravity, but die “younger” due to the radiation and the lower gravity actually weakening your body quite significantly.

61 minutes and 36.968
For example, 1 Mars-second is 1.027 Earth-seconds, 1 Mars-minute is 61.62 Earth-seconds, and 1 Mars-hour is 61 minutes and 36.968 Earth-seconds.

Thanks to data from rovers and other spacecraft, we know that the Red Planet once fairly sloshed with water—with dry deltas, riverbeds, and sea basins stamped into its surface. But 4 billion years ago, the Martian core cooled, shutting down the dynamo that sustained its magnetic field.

No the earth is larger then Mars. Mars takes only half of earths diameter, but it has the same amount of landscapes as earth. This is because earth is 2/3 ocean, and Mars has no ocean and is completely dry. The planets vary on very much, like temperature and size but they’re geologically very similar.

Mars is also smaller than Earth. Its diameter at the equator is 6,794 kilometres, while Earth’s is 12,756 kilometres. If you measure Mars’s diameter from pole to pole, it is 6,752 km, compared to Earth’s 12,720 km.

At its equator, Mars has a diameter of 4,222 miles (6,794 km), but from pole to pole, the diameter is 4,196 miles (6,752 km). Mars’ radius is, of course, half of planet’s diameter.

We all know that gravity is different on Mars versus the moon versus the Earth. The gravity on Mars is 3.711 m/s² , which is just 38 percent the gravity on Earth. Earth’s gravity is 9.807 m/s² , compared to the moon’s gravity of 1.62 m/s² or just 17 percent of Earth’s gravity.