Celebrity astrophysicist Neil deGrasse Tyson is denying allegations of sexual misconduct leveled against him.

In a public Facebook post, deGrasse Tyson responded for the first time to investigations launched by the Fox and National Geographic networks.

In the post, deGrasse Tyson wrote that he plans to fully cooperate with the investigations.

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“In any claim, evidence matters. Evidence always matters,” he wrote. “But what happens when it’s just one person’s word against another’s, and the stories don’t agree? That’s when people tend to pass judgment on who is more credible than whom.”

“And that’s when an impartial investigation can best serve the truth — and would have my full cooperation to do so,” he added.

In a report published last Thursday on the website Patheos, two women accused deGrasse Tyson of misconduct — one said that the astrophysicist groped her, and another said that he attempted to persuade her to have sex with him and made “misogynistic comments.”

In 2014, a former University of Texas in Austin classmate also accused deGrasse Tyson of drugging and raping her while they were both students.

In the Facebook post, deGrasse Tyson gave detailed denials of each alleged incident, describing them as he says he remembers them.

“I’m the accused, so why believe anything I say? Why believe me at all?” he noted, saying that he welcomes the investigations from Fox and National Geographic.