Dig deeper at pwnphysics.blogspot.comOn this day in physics: 24 March 1820- Happy Birthday to Edmond Becquerel, a French physicist who is credited with first observing the photovoltaic effect. His father was Henri Becquerel, the discoverer of radioactivity, and the namesake of the SI unit of radioactivity, the Becquerel.Word of the Day- Deimos is the second and smaller moon of Mars. It is much further away than Phobos, 23,000 km from Mars, compared to Phobos' 6,000 km. Because it is further away, it has an orbital period of roughly 30 hours, compared to Phobos' 7.5 hrs. In Greek mythology, Deimos is the twin brother of Phobos. It is half the size of Phobos and is very similar to a C or D class asteroid in makeup.Quote of the Day- "It shouldn't be humans to Mars in 50 years, it should be humans to Mars in ten." -Robert ZubrinKeywords: Becquerel, Radioactivity, Deimos, Mars