What can be observed only by observing its effects on gravity?
O dark matter
a solar neb...
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Chemistry, 21.06.2019 20:00
Different isotopes indicate that an element will have different numbers of
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Chemistry, 22.06.2019 13:00
In what environment would mineral formation caused by high pressures and high temperatures most likely occur?
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Chemistry, 22.06.2019 13:30
Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?
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