Mars' moons are much smaller than, for example, Earth's Moon, or the larger moons of Jupiter. A large moon will have a larger gravity, which will tend to pull the moon together into a spherical shape.
There are two planets with an almost perfectly spherical shape. They are Mercury and Venus.
No. All planets are spherical.
No. Only the larger moons are spherical. Smaller moons do not have strong enough gravity to make themselves round and so are irregular in shape. Perfect example are Phobos and Deimos, the two tiny moons that orbit Mars.
The property responsible for the non-spherical shape of both the moons is the planet Mars doesn't have a strong enough gravitational influence over the moons to make them spherical. This is also why they have a highly eccentric orbit.
Venus is roughly spherical, as are all planets.
The inner planets (Mercury, Venus, Earth, Mars) in our solar system are all roughly spherical in shape due to their gravity compressing their material into a spherical form. They lack the mass to maintain a more irregular shape like some larger moons or asteroids.
The inner planets have a spherical shape. In fact all planets are more or less spherical.
There are two planets with an almost perfectly spherical shape. They are Mercury and Venus.
Planets are all spherical.
No. All planets are spherical.
Spherical
No. Only the larger moons are spherical. Smaller moons do not have strong enough gravity to make themselves round and so are irregular in shape. Perfect example are Phobos and Deimos, the two tiny moons that orbit Mars.
Spherical
Planets by definition are required to have achieved hydrostatic equilibrium, and thus have a spherical shape - and not a highly rough, irregular shape like many smaller asteroids. In order to achieve this they need to be quite massive. So one might say, all planets have a large spherical shape; the largest in our solar system being Jupiter. Because of their rotation, planets are slightly oblate (or squished at the poles, as oppsed to spherical prolation which would be be slightly stretched).
due to own gravitational force
Those things are asteroids, which are generally too small to have enough gravity to make them spherical.
Approximately "spherical".