Did ancient people build huge temples and discover planets?

Yes, ancient civilizations constructed monumental temples as expressions of their religious beliefs and social organization, with notable examples including the pyramids of Egypt and the temples of the Maya. While they did not discover planets in the modern scientific sense, ancient astronomers, such as those in Mesopotamia and Greece, observed celestial bodies and documented their movements, leading to early understandings of the cosmos. Their observations laid the groundwork for later astronomical discoveries.