Q: Answer this question: when is halley's comet next?
A: Halley's Comet last appeared in the inner Solar System in 1986 and will next appear in mid-2061.

Q: Answer this question: when did the civil rights movement begin?
A: The civil rights movement was a series of worldwide political movements for equality before the law that peaked in the 1960s.

Q: Answer this question: how was the moon formed?
A: The Moon is thought to have formed nearly 4.5 billion years ago, not long after the Earth.

Q: Answer this question: what people used mayan numeral system?
A:
Maya numerals are a vigesimal ( base - twenty ) numeral system used by the Pre-Columbian Maya civilization .