Why do people refer to Venus being Earth's "sister planet"?

Question

Explain the similarities between Earth and Venus. Thanks!

Answer 1

Yenus and Earth are about the same sixe, density and gravity, so they are considered sister planets. Both are probably composed of the same materials, but we won't know for sure until we can bring back samples of venusian rock. It is likely though, since the density and gravity are similar. Where they differ is in the atmosphere, surface temperature and pressure. Venus is much hotter since it is closer to the sun and its atmosphere is composed almost entirely of greenhouse gases(about 900 degrees Celsius at the surface)

Answer 2

Diameter of Planet Venus = 7,521 Miles
Diameter of Planet Earth = 7,926 Miles
...So the size of the planets is almost the same.

Distance of Venus from the Sun = 67.2 Million Miles
Distance of Earth from the Sun = 93 Million Miles
...So we are in the same realm of distance from our heat and
light source. However, since Venus is closer, we can expect it to be much hotter there.

Average surface temperature on Venus = 867 Degrees F
Average surface temperature on Earth = 59 Degrees F

Orbital period of Venus = 224.7 Earth Days
Orbital period of Earth = 365.26 Earth Days
So, Venus has a shorter "year."

Rotational period of Venus = 243 Earth Days
Rotational period of Earth = 23.93 Earth Hours
However similar the two planets might be, this one factor
is way out of whack. Venus is just barely turning around.
As a result, its surface is slowly burned to a crisp by the Sun.
Venus is the slowest spinning planet of all the planets in our Solar System.

Venus has no Moons.
Earth has one Moon.

The atmosphere around Venus is rich in carbon dioxide with some nitrogen and other trace gases. The high temperature on the surface prevents leafy green plant life, and water would have been boiled off long ago.

A thick cloud of sulphuric acid droplets surrounds the planet almost all the time. This cloud is at least fifty miles deep making it one of the thickest atmospheres we have seen. The atmospheric pressure on Venus is roughly 90 times that of Earth.

Venus and Earth both have active volcanos.

Regards,
Zah


The materials and composition of Venus and the Earth are very similar. It has a silicate crust just like that of Earth.

Answer 3

I think the previous answerer has it right:

Venus and Earth are very close to the same size:
Earth = mass of 45.9742 x 10^24 kg, density 5.515 g/cm^3, radius of 6378.140 km

Venus = mass of 4.8690 x 10^24 kg, density 5.24 g/cm^3, radius 6051.9 km

Both have cloudy atmospheres. Venus orbit is closer to ours than Mars'. And until we got some very sensitive instruments out there, everybody assumed that Venus would have a similar (though warmer) climate than the Earth -- think of how many old sci-fi/fantasy novels and movies had civilizations on Venus. But instruments discovered that Venus suffers from a runaway greenhouse effect, and surface temperatures there are on the order of 730°K = 457°C = ~855°F!! And the atmosphere, which was originally thought to be water vapor, turns out 96.4% carbon dioxide, 3.4% nitrogen, and only 69 parts-per-million oxygen! Hardly a hospitable place . . .

Answer 4

Earth is close in size as Venus.

Earth is 7,926 miles in Diameter and Venus is 7,521 miles in Diameter. .

Venus's gravity is 91 pounds on Venus to 100 Earth pounds.

And Venus's average distance from the sun is 67.1 million miles while Earth's is 93 million miles.

There are no other planets in our Solar system as similar as Venus and Earth.

Answer 5

If Earth is the younger sister, then Venus would be the older sister who let her CO2 levels go. If you brought Venus' atmosphere to a reasonable mix, then her and the Earth would look almost identical. And the same goes that if you let our CO2 levels skyrocket then we would look like Venus. Uh-oh, maybe we should at least hear those left-wingers out.

Answer 6

It's very similar in size and people thought it had a similar climate until it was discovered that it runs about 700 degrees.

Answer 7

This stuff is all in your textbook, I promise.