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Latest Asaph Hall Stories

Mars' Moons Vs. Earth’s Moon
2013-02-18 09:19:35

Rayshell Clapper for redOrbit.com — Your Universe Online Earth has one moon, and it is considerably larger than Pluto. In fact, the relative size of Earth´s moon is quite massive compared to the moons of other planets. We have a fascination with our moon on many levels. But what if Earth had two moons as Mars does? According to NASA, unlike Earth´s moon, Mars moons are two of the smallest in the entire solar system. Mars moons also have proper names: Phobos and...

Deimos Orbital Model Improved
2012-09-26 10:27:22

April Flowers for redOrbit.com - Your Universe Online 135 years ago, a scientist named Asaph Hall discovered Phobos and Deimos, two small moons orbiting Mars. Since then, the moons have been photographed innumerable times from Earth and from spacecraft, including recent measurements by the Mars Exploration Rovers panoramic cameras and the Mars Reconnaissance Orbiter. The orbit of Phobos, the inner moon, has been calculated to an accuracy of less than 1 kilometer. But, despite this...


Latest Asaph Hall Reference Libraries

4_c91b1dfe41863cf4e6fae5fdc43cefe32
2004-10-19 04:45:40

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...

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Word of the Day
abrosia
  • Wasting away as a result of abstinence from food.
The word 'abrosia' comes from a Greek roots meaning 'not' and 'eating'.