Posted August 22nd, 2007, 04:18 PM |
#7 (permalink)
| | its a hoax , an outright lie boiragi re pitano dorkar aisob wrong information post korar jonno. read below Planet Mars will be the brightest in the night sky starting August.
moon is the brightest object except on new moon... and 27 august is NOT a new moon day.... in fact... its a full moon day... the moon will be very bright... according to the astronomical sky charts the moon has a magnitude of 12.32 and mars has a magnitude of 0.41... the magnitude is expressed as a log10 term... like decibels in sound intensity... so the moon is 2.512(12.24 - 0.42) brighter than mars.... numerically, that is 57,500 times...
how does brightness work?
brightness (light intensity) obeys the inverse square law... that is... a lamp 1 meter away from you would have 4 times the brightness if it was 2 meters away from you...
planets and moons such as mars, the moon, jupiter etc. do not emit light, instead they reflect light (from the sun)...
so think of mars and the moon as giant mirrors... plant will be seen as a disc to an observer (you) on earth... the amount of light reflected would depend on the (projected) area of the object... which means that mars would reflect 4 times the amount of light than the moon... (because area of a circle is proportional to the square of its radius, A=πR2) but the moon is 470 times closer to earth than mars... which means its (470) |