He said this is significant because it would mean Newton 's law of universal gravitation is incorrect .
Brian asserts that in the 1960s , NASA discovered that the Moon 's gravitational field was 64 percent as powerful as the Earth 's .
Brian said this is significant because it would mean Newton 's law of universal gravitation is incorrect .
Brian asserts that in the 1960s , NASA discovered that the Moon 's gravitational field was 64 percent as powerful as the Earth 's .