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Pioneer 10 will continue to coast silently as a ghost ship through deep space into interstellar space, heading generally for the red star Aldebaran, which forms the eye of Taurus (The Bull). Aldebaran is about 68 light years away and it will take Pioneer over 2 million years to reach it.
12). How long will orbital debris remain in Earth orbit? The higher the altitude, the longer the orbital debris will typically remain in Earth orbit. Debris left in orbits below 600 km normally fall back to Earth within several years. At altitudes of 800 km, the time for orbital decay is often measured in decades. Above 1,000 km, orbital debris will normally continue circling the Earth for a century or more. Return to Top
The basic timeline is a 4.5 billion year old Earth, with (very approximate) dates:
* 3.8 billion years of simple cells (prokaryotes),
* 3 billion years of photosynthesis,
* 2 billion years of complex cells (eukaryotes),
* 1 billion years of multicellular life,
* 600 million years of simple animals,
* 570 million years of arthropods (ancestors of insects, arachnids and crustaceans),
* 550 million years of complex animals,
* 500 million years of fish and proto-amphibians,
* 475 million years of land plants,
* 400 million years of insects and seeds,
* 360 million years of amphibians,
* 300 million years of reptiles,
* 200 million years of mammals,
* 150 million years of birds,
* 130 million years of flowers,
* 65 million years since the non-avian dinosaurs died out,
* 2.5 million years since the appearance of the genus Homo,
* 200,000 years since humans started looking like they do today,
* 25,000 years since Neanderthals died out.
The Kardashev scale is a theoretical method of measuring an advanced civilization's level of technological advancement and energy consumption in a cosmic perspective.
If Aldebaran A's substellar companion "b" does actually exist with its apparent inner orbit, then it is highly unlikely that an Earth-type planet could have formed in Star A's water zone before it left the main sequence. Even if such an orbit were possible, any Earth-type planets that orbited Aldebaran A during its youth would have been burnt to a cinder by now, and possibly fallen into the star from frictional drag with the giant star's gaseous envelope. Astronomers would find it very difficult to detect an Earth-sized planet around this star using present methods.
Originally posted by requireduser
hope we can live that long 2 witness those satellites.
Originally posted by JibbyJedi
Are you one of those perpetrators of the "what if" alien bs? Come on man, that's all every Discovery/ History channel ever starts, and ends with, a "what if" question that is basically the sum up the the 1 hour people waste watching these programs.
"Tonight on Alien Discoveries..... what if Earth has been visited by alien life..... and what if aliens really planted us here..... and what if your mother sold Heroin for food stamps......?"
I'm tired of the false premise advertising programs that tell us nothing concrete and just ask more questions. It never ends, every program on Mainstream TV starts and ends with the same QUESTION..... stop feeding into these bs programs!edit on 19-8-2011 by JibbyJedi because: (no reason given)