The conversation between human and AI assistant.
Who discovered that the Earth was round? How was this discovered?
What kind of evidence did Galileo and Newton provide for a round Earth?
Galileo used telescopes to observe the phases of Venus, which could only be explained by a round, orbiting planet. Newton's law of universal gravitation also supported the idea that the Earth had a spherical shape, since only a round object could sustain a uniform gravitational force from all sides.