Will we need to replace conventional rockets to send manned missions further into space?

Currently, chemical rockets have taken men to Earth orbit and the moon by combusting rocket fuel to generate thrust.

Even if we develop more efficient rocket fuels and can create significantly larger thrust/mass of propellant ratios, is there a limit to how far we can go? Is there going to be a point when without creating enormous, expensive spacecraft, chemical propulsion can go no further and are we going to need to look to other ideas, such as nuclear power or antimatter?

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Will we need to replace conventional rockets to send manned missions further into space?

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