Answer to Dictation 1
Scientists are a step closer to providing an affirmative answer to the question.
Go to Dictation 2
Answer to Dictation 2
Astronomers have been observing the heavens for signs of extraterrestrial life.
Go to Dictation 3
Answer to Dictation 3
They had detected a chemical that provides the conditions for life forms.
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Answer to Dictation 4
He announced the existence of two chemicals called DMS and DMDS.
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Answer to Dictation 5
The astronomers said the chemicals are the most promising signs yet of life.
Go to Dictation 6
Answer to Dictation 6
The two biosignatures were discovered on a planet called K218b.
Go to Dictation 7
Answer to Dictation 7
One light year is approximately 9.46 trillion km.
Go to Dictation 8
Answer to Dictation 8
A potentially habitable planet covered in liquid water with an abundance of hydrogen.
Go to Dictation 9
Answer to Dictation 9
An ocean that is teeming with life is the scenario that best fits the data we have.
Go to Dictation 10
Answer to Dictation 10
He needed to be 99.99994% certain to state as fact that we are not alone.
See the exoplanet K2-18b lesson for the whole text.
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