venus
size, mass, density, and volume. Other than that, its VERY different
In our own solar system, the planet whose density and internal structure most resemble that of the Earth is Venus. There may be other planets elsewhere in the galaxy which resemble Earth even more closely, but we have not had the opportunity to observe them.
Density = mass / volume
That might be an indication that Mercury has a similar composition to Earth. For more details, check the Wikipedia articles on Earth, and Mercury, to see what is believed to be inside each planet.
Mars
size, mass, density, and volume. Other than that, its VERY different
We know the size (volume) of the planet AND its mass. Density is mass divided by volume.
Density is a quantity shared by objects with mass and volume. Volume is the ratio of density to mass, whereas mass is the product of volume and density. Earth and Venus are two planets with similar mass and volume. Venus is slightly smaller.
Volume increases with the Cube of the radius, so an easy way to compute the volume of the giant planet is to simply take the ratio of the radius Giant Planet: Earth and raise it to the 3rd power.Since these planets are the same shape (Spherical) this ratio is accurate enough for our purposes. In the case of an object that is oblate (like Saturn or Jupiter), one can still calculate the volume accurately by taking the Equatorial Radius squared and multiplying it by the Polar Radius.In this given case the volume of Giant Planet = 14 x 14 x 14, or 2,744x that of Earth.Since Mass = 681x that of Earth, Density = 681/2744 = 0.248 of Earth's (just a little under one quarter).You could go one step further to calculate the density of this object by multiplying the density ratio by Earth's density (5.515x water) - so Giant Planet's density = 1.369 grams/cm3.
Venus and Earth are about the same size and density. It is thought that the Earth could turn into a planet like Venus if global warming goes out of control.
The planet that has enough density to support the weight of a colony is Mars. Scientists have discovered that Mars is relatively similar to the conditions on Earth.
Earth's density: 5520 kg/m3 Saturn's density: 690 kg/m³
In our own solar system, the planet whose density and internal structure most resemble that of the Earth is Venus. There may be other planets elsewhere in the galaxy which resemble Earth even more closely, but we have not had the opportunity to observe them.
Earth has the highest density, which is equal to 5.5153 g/cm3 However, if you remove gravitational compression the materials of which Mercury is made would be denser, with an uncompressed density of 5.3 g/cm3 versus Earth's 4.4 g/cm3
Density = mass / volume
That might be an indication that Mercury has a similar composition to Earth. For more details, check the Wikipedia articles on Earth, and Mercury, to see what is believed to be inside each planet.
Density = mass / volume since earth is nearly spherical, Volume = (4/3)pi x r3 find volume, then divide this into the mass.