Asaph hall

Asaph Hall

Asaph Hall was about to give up his frustrating search for a Martian moon one August night in 1877. but his wife angelia urged him on. He discovered Deimos the next night.and phoboos six nignts after that.


Hall named the moons for the mythological sons of Ares, the Greek counterpart of the Roman god, Mars. Phobos means fear or panic (think "phobia"), and Deimos means flight (as in running away after an overwhelming defeat). Fitting names for the sons of a war god.

Aug 30, 2014 ... 1877: Asaph Hall discovers the two moons of Mars, Phobos and Deimos. 1965: NASA's Mariner 4 sends back 22 photos of Mars, the world's ...

Phobos has only 1/1000th as much gravitational pull as Earth . A 150-pound (68 kg) person would weigh two ounces (68 grams) there. Yet NASA's Mars Globul surveyor has shown evidence of landslides, and of boulders and dust that fell back down to the surface after being blasted off the moon by meteorites.

Though details of Mars' surface are difficult to see from Earth, telescope observations show seasonally changing features and white patches at the poles. For decades, people speculated that bright and dark areas on Mars were patches of vegetation, Mars was a likely place for advanced life forms, and water might exist in the polar caps. When the Mariner 4 spacecraft flew by Mars in 1965, photographs of a bleak, cratered surface shocked many - Mars seemed to be a dead planet. Later missions, however, showed that Mars is a complex planet and holds many mysteries yet to be solved. Chief among them is whether Mars ever had the right conditions to support small life forms called microbes.

Date/s of discoverise

  • 1965: NASA's Mariner 4 sends back 22 photos of Mars, the world's first close-up photos of a planet beyond Earth.
  • 1976: Viking 1 and 2 land on the surface of Mars.
  • 1997: Mars Pathfinder lands and dispatches Sojourner, the first wheeled rover to explore the surface of another planet.