yes it has gravity, that's how the plants orbit it.
There certainly is gravity outside the atmosphere. For example, it is gravity that keeps the Moon in orbit around the Earth, and the Earth in orbit around the Sun.
inner core radition
no, it's way too close to the sun to hold onto an atmosphere without the sun's gravity riping it apart, plus the solar winds are too strong for mercury to hold it's atmosphere.
A magnetic field holds atmosphere to the planet. Without a magnetosphere the solar wind from the sun will blow the atmosphere away. That is why our planet still has an atmosphere, we have the magnetic poles.
Mercury does get affected by the sun's gravity, which keeps it in orbit around the sun. However, the speed at which Mercury orbits the sun, along with its distance from the sun, allows it to maintain a stable orbit rather than being pulled in completely.
Mercury - the closest planet to the sun. Solar wind and radiation from the sun also blast off some of Mercury's minuscule atmosphere (Mercury's atmosphere is sometimes referred to as an exosphere)
Mercury - the closest planet to the sun. Solar wind and radiation from the sun also blast off some of Mercury's minuscule atmosphere (Mercury's atmosphere is sometimes referred to as an exosphere)
Mercury - the closest planet to the sun. Solar wind and radiation from the sun also blast off some of Mercury's minuscule atmosphere (Mercury's atmosphere is sometimes referred to as an exosphere)
Mercury has no atmosphere due to its small size and due to the fact it is close to the sun, which has effectively 'burned' off any atmosphere that it may have had.
The Moon's atmosphere is like . . . nothing. There isn't one. The Moon does not have enough gravity to hold onto an atmosphere while the Sun is successfully making any atmosphere dissipate into space.
The planets' own gravity has made them spherical. Also there are other effects such as their ability to retain an atmosphere, etc. The Sun's gravitycauses the orbits of the planets.
The atmosphere is above the surface of the Earth because gravity pulls it towards the planet. The atmosphere contains gases that are essential for life, such as oxygen and nitrogen, and it helps regulate the planet's temperature by trapping heat from the sun.