Latest Asaph Hall Stories
Earth has one moon, and it is considerably larger than Pluto. In fact, the relative size of Earth’s moon is massive compared to the moons of other planets. But what if Earth had two moons as Mars does?
The orbit of Phobos, the inner moon, has been calculated to an accuracy of less than 1 kilometer. However, the orbit of Deimos is still not known to a high degree of accuracy.
Mars' Moon Phobos -- in astronomy, innermost moon, or natural satellite, of Mars. Phobos orbits Mars at a distance of only 9,378 km (5,627 mi), closer to its planet than any other moon in the solar system. In fact, it is so close that the force of Mars's gravity is stronger than the force keeping the moon in its orbit, so the radius of Phobos's orbit is decreasing at the rate of about 1.8 m (about 6 ft) per century. In 40 million years, Phobos will either break apart into a ring...
- A volcanic mudflow.