Although you may rarely think about it, you also cannot live outside of a certain range of temperature and pressure that the surface of our planet and its atmosphere provides.

A can is crushed when the pressure outside is greater than the pressure inside, and the pressure difference is greater than the can is able to withstand. When the water vapor condensed, the pressure inside the can became much less than the air pressure outside. Then the air outside crushed the can.

The weight of air in a column of the height of the atmosphere and area 10 cm � 10 cm is as large as 1000 kg. The reason we are not crushed under this weight is that the pressure inside our bodies is also equal to the atmospheric pressure and cancels the pressure from outside.

The air inside of your lungs is at the same pressure as the air outside, so it presses your chest cavity outward with the almost same force as it is being pressed inward (slightly less, because there is more surface area on which pressure is applied outside than in, and that is why you exhale when you relax).

It is defined as exactly equal to 100,000 Pa (100 kPa), or slightly less than the current average atmospheric pressure on Earth at sea level (approximately 1.013 bar). By the barometric formula, 1 bar is roughly the atmospheric pressure on Earth at an altitude of 111 metres at 15 °C.

Everyone knows the Sun is big. The Sun accounts for 98% of the mass of our entire solar system. And compared to the densest planet, which is our very own planet Earth, the Sun is more than a million times more massive! In fact, it would take roughly 1,300,000 planet Earths to fill the entire Sun!

According to one hypothesis, super-Earths of about two Earth masses may be conducive to life. The higher surface gravity would lead to a thicker atmosphere, increased surface erosion and hence a flatter topography.

NASA estimates 1 billion ‘Earths’ in our galaxy alone. There are a billion Earths in this galaxy, roughly speaking. Not a million. A billion.

Kepler-145b is one of the most massive planets classified as mega-Earths, with a mass of 37.1 M ⊕ and a radius of 2.65 R ⊕, so large that it could belong to a sub-category of mega-Earths known as supermassive terrestrial planets (SMTP).

The answer: diamonds, and lots of them. Combined with a dash of oceanic crust rock called eclogite, just over a quadrillion—a one with 15 zeroes—tons of diamonds are hiding within Earth, they estimate. To be fair, that’s only a small percentage of the total rocks on Earth, Garber notes.

200 km