Let's know
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" The universe is a pretty big place . If it's just us , seems like an awful waste of space . "- Carl Sagan " The greatest enemy of knowledge is not . ignorance , it is the illusion of knowledge . " --Stephen Hawking " If there is life on Mars , I believe we should do nothing with Mars . Mars then belongs to the Martians , even if the Martians are only microbes . " - Carl Sagan "THE EINSTEIN RULE If you can't explain it to a six year old , you don't understand it yourself "- Albert Einstein " It is far better to grasp the universe as it really is than to persist in delusion , however satisfying and reassuring "". Carl Sagan
Welcome to the Universe
Solar System
Dwarf Planets
The Planets
NASA
Space X
ESA
Cosmic History
