Answer:
The gaseous giants that Renaissance scientists such as Galileo knew are:
- Jupiter.
- Saturn.
Explanation:
Firstly, we can eliminate the option of Mars because it's not a gaseous giant, this name applies to Jupiter, Neptune, Saturn, and Uranus.
By another side, the Renaissance happened between 1300-1600 a.C., and by this reason, any planet discovered after that date wasn´t known by the Renaissance scientist, such as Uranus (discovered in 1781) and Neptune (discovered in 1846), then, the options that apply are Jupiter and Saturn, in the case of Saturn, Galileo could see its rings himself.
The gaseous substance which Galileo discovered is Jupiter and Saturn.
During the Renaissance, Galileo made notable discoveries, Although no individual is given the credit of being the first to discover Saturn, Galileo is known as the first man to look at Saturn using a telescope in the year 1610.
In the year 1610, Galileo looked at Saturn via the telescope and was able to see a pair of objects on both sides of the planet.
Furthermore, Galileo discovered Jupiter had four moons in its orbit, this discovery showed that the earth is actually not the center of the universe.
Galileo Galilei discoveries gave a lot of insights into the solar system. Galileo is known as the foremost scientist of the Renaissance era as well as the father of modern science.
Therefore, the gaseous substance Galileo know about is Jupiter and Saturn.
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