Space travel for the next century and beyond: no more nuclear power sources

The fact that the soonest humans will return to the moon is in 2025 and Mars in the 2040s. We don't have the chance to colonize another planet in the next century. We are not solving anything on Earth for the next 3 decades, neither space travel. We just can't solve anything and we are crazy lazy for that. <br><br>We also don't have the tech for long term missions. Nuclear power sources will be necessary for interplanetary travel in the next century. We will not have solar power and nuclear power sources. They won't be risked in long term missions. <br><br>We won't have another planet to colonize in this century.