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What basic property is responsible for the non spherical shape of both Phobos and Deimos?
Why are Phobos and Deimos not spherical? Their gravity fields are too weak to pull their material into a spherical shape.
What makes Phobos different from other moons?
Phobos has the closest orbit to its primary of any moon in the solar system, but still only appears a third as wide as Earth’s full moon. Phobos orbits only 3,700 miles (6,000 km) from the Martian ground. Its surface is marred by debris that may have come from impacts on Mars.
What is the dominant feature of Phobos and who is it named for?
The dominant feature on Phobos, it found, was a crater six miles (10 kilometers) wide—nearly half the width of the moon itself. It was given Angelina’s maiden name: Stickney. Named after the Roman god of dread, Deimos is the smaller of Mars’ two moons.
How was the moon Phobos formed?
One idea is that Phobos is a captured asteroid. It is possible that Phobos formed in situ at Mars, from ejecta from impacts on the Martian surface, or from the remnants of a previous moon which had formed from the Martian accretion disc and subsequently collided with a body from the asteroid belt.
Is Titan tidally locked?
Titan is also tidally locked in synchronous rotation with Saturn, meaning that, like Earth’s Moon, Titan always shows the same face to the planet as it orbits. Saturn takes about 29 Earth years to orbit the Sun (a Saturnian year), and Saturn’s axis of rotation is tilted like Earth’s, resulting in seasons.
Where is Enceladus?
Enceladus is one of the major inner satellites of Saturn along with Dione, Tethys, and Mimas. It orbits at 238,000 km from Saturn’s center and 180,000 km from its cloud tops, between the orbits of Mimas and Tethys.
Why are Mars moons Deimos and Phobos irregularly shaped not spherical )?
The moons are aspherical because gravity is too weak to overcome the rock stresses. Smaller moons are generally less spherical. The nearer moon, Phobos has less dust because it is nearer from Mars and is less able to gravitationally hold onto its residual dust from its cratering than Deimos.
What shape is Deimos?
Exploring the moons In 1971, NASA’s Mariner 9 spacecraft became the first manmade satellite to orbit another planet. Images from the craft revealed that both Deimos and Phobos have lumpy, potato-like shapes, rather than being spherical like Earth’s moon.
Can you land on Phobos?
A Phobos landing won’t be like a moon landing. At it’s widest, Phobos is just 14 miles across. Attaching in orbit could be done with minimal fuel, and because a return mission wouldn’t need to escape a planet-sized gravity well, a spacecraft departing Phobos would need a lot less fuel to launch than one leaving Mars.
What is the sidereal period of Phobos?
686.98 Earth days
Mars has two moons: Phobos and Deimos….
|Average distance from the Sun||228 x106 km (142 million miles, 1.524 astronomical units)|
|Mean orbital speed||24.13 km/s (15.0 miles/s)|
|Sidereal period||686.98 Earth days (1.88 years)|
|Synodic period||779.94 days (2.14 years)|
|Inclination of orbit to the ecliptic||1.85°|
How were Phobos and Deimos formed?
The moons of Mars may have started with a huge collision with a protoplanet one third the mass of Mars that formed a ring around Mars. The inner part of the ring formed a large moon. Gravitational interactions between this moon and the outer ring formed Phobos and Deimos.
What shape is Phobos?
Phobos is a small, irregularly shaped object with a mean radius of 11 km (7 mi). Phobos orbits 6,000 km (3,700 mi) from the Martian surface, closer to its primary body than any other known planetary moon.