Monday - Friday, 6:00 - 7:00 PM ET

CNBC’s Jim Cramer on Wednesday reviewed three sectors where highly-speculative names are gaining traction: space, quantum computing and nuclear power.

“I’ve tried to be skeptical of these three red-hot areas, but as I told you last week, once the thing really takes off, you can’t be a scold,” he said. “The market’s saying, listen, these companies can raise some money, and I think we’ll see scores more coming public.”

This market is “engulfed in the kind of extreme speculation we have not seen in years, arguably since the nineties,” Cramer said. While the averages headed lower on Wednesday, Cramer said the stocks of many companies that make no money and have little revenues are heating up.

Quantum computing stocks have seen a boost thanks to Nvidia