Chat with AIExam 26: Astrobiology
What element is found in all life on Earth?
(84) 
VerifiedC
The first cells must have been simple, single-celled organisms similar to modern _______________.
(82) Verifiedbacteria
Why can't we send a space mission to a star system outside of our own?
(87) VerifiedThe bottom line is that we just don't have the technology to support this kind of travel. The distances between stars are almost beyond comprehension. The fastest human device ever launched, the New Horizons probe currently on its way to Pluto and the Kuiper Belt, will take about 90,000 years to travel the distance to the nearest star, 4 light-years. The obvious way to overcome these huge distances is with tremendously fast spaceships, but even the closest stars are many light-years away.
Nothing can exceed the speed of light, and accelerating a spaceship close to the speed of light takes huge amounts of energy. Even if you travel slower than light, your rocket would still require massive amounts of fuel. If you wanted to pilot a spaceship with a mass of 100 tons (about the size of a fancy yacht to the nearest star, and you traveled at half the speed of light so as to arrive in eight years, the trip would require 400 times as much energy as the entire United States consumes in a year. Don't even think about how much fuel the starship Enterprise needs.
These limitations not only make it difficult for humans to leave the Solar System, but they would also make it difficult for aliens to visit Earth.
Can there be life on Mars? Is there proof that life existed on Mars? Defend your answer.
(77) What prevents Titan from being a candidate for supporting an evolution of life?
(89) If we have the technology to transmit messages, then why can't we "carry on a conversation" with an alien civilization?
(78) Jupiter's moon _______________ appears to have a liquid-water ocean below its icy crust and may contain minerals as a source of raw material for chemical evolution.
(76) Genes are organized into long coiled chains called _______________.
(91) When a cell divides, only one cell gets the original DNA molecules.
(75) Which moon is rich in organic molecules but too cold to support chemical evolution?
(64) What did astronomers use in the anticoded message sent to globular cluster M13?
(87) _______________ are fossilized remains of colonies of single-celled organisms that built up layer after layer of trapped sediments.
(90) Which describes the direct change in genetic information of a cell?
(92) Why is it difficult to find fossils representative of the time that life began on Earth?
(74) Verified (75) The most likely first form of life on Earth was probably an archaea-like extremophile tolerant of high temperatures.
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