Earth is the only known planet with an oxygenated atmosphere.
Why would there be only half a planet?
Mercury, the known planet that orbits closest to the sun, has no atmosphere.
No. No. The only planet n contact with Earth's atmosphere is Earth itself.
No. Mercury essentially has no atmosphere. Earth is the only planet with an atmosphere that humans can breathe.
The only outer planet without a thick atmosphere is Uranus. It has a thin atmosphere composed mostly of hydrogen and helium with traces of methane.
No. The planet only appears blue due to all that methane in the athmosphere.
jupiter
The planet Mars is the only planet known with two moons and a predominantly CO2 atmosphere.
Earth. It's the only planet with significant amounts of oxygen in the atmosphere, making up about 21%.
I'm guessing you meant the planet with the only moon with a THICK atmosphere, since many moons have an atmosphere, although in very small amounts. If that's the case, then the answer is Saturn, with Titan as its moon, which is the only moon that have a thick atmosphere.
earth