Answer:
1. supernova
2. bubble
3. atomic hydrogen cloud
4. molecular cloud
Explanation:
Supernova involves the bright explosion of a star when this happens it returns gas and new elements in to space. The expelled hot gas from the explosion forms a bubble and starts expanding in size. As this bubble cools, it merges merges with other interstellar gas to form an atomic hydrogen cloud. The atomic hydrogen cloud cools further to form a molecular cloud where another star formation begins to occur.
In 1967, John Wheeler invented the name "black hole" for the first time. However, there is no unified naming system for black holes.
In a real system of levers, wheel or pulleys, the AMA (actual mechanical advantage) is less than the IMA (ideal mechanical advantage) because of the presence of friction.
In fact, the IMA and the AMA of a machine are defined as the ratio between the output force (the load) and the input force (the effort):
however, the difference is that the IMA does not take into account the presence of frictions, while the AMA does. As a result, the output force in the AMA is less than the output force in the IMA (because some energy is dissipated due to friction), and the AMA is less than the IMA.
D.very small amounts of mass.
Answer:
B. has the greatest mass
Explanation:
mass & distance affect pull
grativy affects speed & shape of orbit of the planet
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