Our earth living beings are made up of Carbon,Hydrogen and Oxygen as main constituent and hence this atmosphere presently we have such as Nitogen and Oxygen for life cycle. The Exoplanet may have life that may have a constitution other than our type. So the exoplanet must have the atmosphere to support those living beings. Even the atmosphere may have full of electric chatges(may be) to support living things who sustain upon electric charges.This is only assumption.
Earth is a planet, not a solar system.
Most planets are made of some kind of terrain and atmosphere. Most planets in our solar system have a terrain that consists of some kind of rock, ice, sand, or dirt that forms the planet and an atmosphere that consists of a gas.
It has a gassy atmosphere because Saturn is made from it.
A moonless planet. In our Solar System, Mercury and Venus do not have a moon.
Water, and an atmosphere
No not really all have a atmosphere of some kind, some not fit to live in.
Earth itself is largely protected from the solar wind by its magnetic field, which deflects most of the charged particles; however some of the charged particles are trapped in the Van Allen radiation belt. XxBaby Dee
Earth is a terrestrial planet, characterized by a solid surface, water, and a breathable atmosphere. Mars is also a terrestrial planet, but it is smaller and colder than Earth, with a thin atmosphere and evidence of past water flow on its surface.
There are hydrogen and helium from the Solar wind. There are also oxygen, sodium and potassium from chemical and radioactive processes on the planet's surface.
So far no planet has been discovered that would support our kind of life, certainly not in our solar system
The largest planet within our solar system is Jupiter. However, Astronomers say they have discovered what appears to be an entirely new kind of planet, an extra-large gas giant unlike any known world in our solar system or beyond. It is the largest planet ever discovered and boasts a radius nearly 1.4 times larger than Jupiter's. Click on the related links section indicated below to read about this new and exciting discovery.
Not much gas at all, as Mars is a rocky planet with not much of an atmosphere.