Astronomy is not a luxury, it's a necessity,and we still use it in different ways,but we use it as energetically, as emphatically,as our ancestors ever did."Extreme Universe"
Mars Mission
www.nasa.gov/mission_pages/msl/index.html
"Advanced aliens would perhaps become nomads - looking to conquer and colonize whatever planets they can reach." 【Stephen Hawking 】
In 2057, the centenary of the space era, "we should be celebrating 20 years of man on Mars," 【Griffin】
Signal Travel Time(from Earth)
44 Minute to mars rover
3 hours to Cassini at Saturn
29 hours to voyager1
1 Light Year = 6,000,000,000,000 miles
Light speed is constant and independent of the source's motion. It may fly against intuition, but it is a fact of nature.
"I don't think the human race,will survive the next thousand years unless we spread into space."
【Stephen Hawking 】
en.wikipedia.org/wiki/World_population