Active and Passive Voice

Is the sentence 'We left for the airport at 8am' Active or Passive Voice?

Is the sentence 'Photons were discovered by Philipp Lenard in 1902' Active or Passive Voice?

Is the sentence 'The 19th-century physicist James Clerk Maxwell studied electromagnetic radiation.' Active or Passive?

Voice of the sentence: 'We need light to see.'

Voice of the sentence: 'Galileo Galilei invented the first telescope, saw the moons of Jupiter, and made many discoveries.'

Active or Passive Voice? The swirling gases of the Crab nebula are lit up by a pulsar.

Active or Passive Voice? The swirling gases of the Crab nebula are lit up by a pulsar.

Active or Passive Voice? Galileo described a ship at sea to prove theories about acceleration.

Active or Passive Voice? The Mathematical Principles of Natural Philosophy was written in 1687 by Isaac Newton.

Is the sentence 'Energy takes many forms' Active or Passive Voice?