NASA and ESA have many orbiting space crafts around mars. Mars reconnaissance orbiter and mars odyssey. relay data to earth via DSN stations around world.
Mecury 4878 KM Venus 12104KM Earth 12756KM Mars 6794KM Jupiter 142800 Saturn 120000KM Uranus 52000KM Newptune 48400KM Pluto 3200km. Data from BAA hand book.
Light-years is not an adequate measure for distances inside the solar system. Symply a light-year is a humongously large measure of distance. The distance between Earth and Mars is at...
Expansion of space as a result of doesn’t operate on these sort of scales. Even the galaxy doesn’t show this effect, due to gravity overpowering any expansion. The solar system...
You radio wave should travel at the speed of light in vacuum $c=3xx10^8m/s$ so basically it would take (velocity=distance/time rearranged): $t=d/c=(8.2xx10^10)/(3xx10^8)=273s$ to reach Mars.
The terrestrial planetds are believed to gave have formed separately from accretion of matter at different ranges of distance from . Moreover, Mercury is so dense that astronomers are led...
Earth's satellite Moon a;lso have rovers landed on it. Saturn and Jupiter are gas giants with out surface,Other planets were visited and orbited by space probes.,But no rovers landed. details...
The 2 most hazardous things about Mars are the atmosphere and the lack of a of any appreciable strength. The first one is pretty obvious, there is almost no...