A declaration of dissent from past and present NASA employees warns that science and safety are at risk and joins similar documents from staff at other federal science agencies

More than 280 NASA employees past and present, including at least 4 astronauts, have signed a declaration of opposition to the many drastic changes that the administration of US President Donald Trump is working to enact.

Hundreds of NASA scientists issued a rare public rebuke on Monday against the agency's funding cuts. More than 285 scientists signed a public letter to NASA interim administrator Sean Duffy, who also leads the Department of Transportation.

Draconian budget and staff cuts could mean another Challenger disaster, warn current and former NASA employees.

Current and former NASA employees have co-signed a declaration protesting changes at the agency that some say pose a grave risk to astronauts.