This family of asteroids is extremely old, dating back to the formation of the Solar System. Hence, it is likely that they were acquired by Mars very early in its history. Phobos is heavily cratered from eons worth of impacts from meteors with three large craters dominating the surface. The largest crater is Stickney visible in the photo above.
The Stickney crater is 10 km in diameter, which is almost half of the average diameter of Phobos itself. The crater is so large that scientists believe the impact came close to breaking the moon apart. Parallel grooves and striations leading away from the crater indicate that fractures were likely formed as a result of the impact.
The largest crater on Deimos is approximately 2. Although both moons are heavily cratered, Deimos has a smoother appearance caused by the partial filling of some of its craters. Compared to our Moon, Phobos and Deimos are rough and asteroid-like in appearance, and also much smaller.
In addition, their composition as already noted is similar to that of C-type asteroids that are common to the Asteroid Belt. Someday, manned missions may be going to Phobos and Deimos. Scientists have discussed the possibility of using one of the Martian moons as a base from which astronauts could observe the Red Planet and launch robots to its surface, while shielded by miles of rock from cosmic rays and solar radiation for nearly two-thirds of every orbit.
And here are some great images of both Phobos and Deimos. Full Moon Guide: October - November A new paper details how the hydrological cycle of the now-dry lake at Jezero Crater is more complicated than originally thought. The spacecraft will continue collecting data about Mars, but engineers will stop sending commands until mid-October. The dusty rocks of Jezero Crater are beginning to tell their story — thanks to the seven powerful science cameras aboard Perseverance.
The lander cleared enough dust from one solar panel to keep its seismometer on through the summer, allowing scientists to study three big quakes. The rover will be delivered to the Moon's surface in late VIPER is the first resource-mapping mission on the surface of another celestial body. Two interactive web experiences let you explore the Martian surface, as seen by cameras aboard the rover and orbiters flying overhead.
Scientists found evidence that an area on Mars called Arabia Terra had thousands of "super eruptions" over a million-year period. Jupiter also has the biggest moon in our solar system, Ganymede. These moons are so big you can see them with just a pair of binoculars.
Saturn has 53 moons that have been named. Saturn also has 29 moons awaiting confirmation. If all of these moons get confirmed, Saturn will have 82 moons. One of these moons, named Titan, even has its own atmosphere, which is very unusual for a moon. Lastly, Neptune has 14 named moons.
One of Neptune's moons, Triton, is as big as dwarf planet Pluto. Make no-bake Moon cookies!
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