Given a scientific passage and an answer, generate a question for the given answer.
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Question: Passage: Jupiter has lots of moons. As of 2011, we have discovered over 60 natural satellites of Jupiter. Four are big enough and bright enough to be seen from Earth using a pair of binoculars. These four moons were first discovered by Galileo in 1610. They are called the Galilean moons . Figure below shows the four Galilean moons and their sizes relative to Jupiter's Great Red Spot. These moons are named Io, Europa, Ganymede, and Callisto. The Galilean moons are larger than even the biggest dwarf planets, Pluto and Eris. Ganymede is the biggest moon in the solar system. It is even larger than the planet Mercury!. Answer: galileo

Answer: Who first discovered the moons of jupiter in 1610?

Question: Passage: Refracting and reflecting telescopes are optical telescopes that use lenses to gather light. Answer: light

Answer: Refracting and reflecting telescopes are optical telescopes that use lenses to gather what?

Question: Passage: The value of , the ideal gas constant, depends on the units chosen for pressure, temperature, and volume in the ideal gas equation. It is necessary to use Kelvin for the temperature and it is conventional to use the SI unit of liters for the volume. However, pressure is commonly measured in one of three units: kPa, atm, or mmHg. Therefore, can have three different values. Answer: pressure

Answer:
What are kpa, atm, and mmhg measurement units for?