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Renowned astrophysicist Neil deGrasse Tyson says he will cooperate fully with an “impartial investigation” into allegations of sexual misconduct that have been leveled against him.

In a Facebook post Saturday, Tyson denied an accusation that he groped a woman and he denied that he made sexual advances toward a production assistant when he invited her to share wine and cheese at his home. He apologized for making the production assistant feel uncomfortable.

"In any claim, evidence matters. Evidence always matters. 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 wrote.

He gave explanations for both accounts separately and concluded saying:

"Accusations can damage a reputation and a marriage. Sometimes irreversibly. I see myself as loving husband and as a public servant – a scientist and educator who serves at the will of the public. I am grateful for the support I’ve received from those who continue to respect and value me and my work."

Patheos.com recently published accounts from two women who say that Tyson behaved in a sexually inappropriate manner toward them. Tyson was host of “Cosmos: Possible Worlds” on Fox in 2014 and a new edition of the series was to air on National Geographic next year.

Fox and National Geographic Networks have said they will conduct a thorough investigation.