Reuters Science News Summary

Following is a summary of current science news briefs. Atomic bombs and whale sharks: How to calculate age of world's largest fish

Scientists have figured out how to calculate the age of whale sharks - Earth's largest fish - with some guidance from the radioactive fallout spawned by Cold War-era atomic bomb testing. By measuring levels of carbon-14, a naturally occurring radioactive element that also is a by-product of nuclear explosions, the researchers determined that distinct bands present inside the shark's cartilaginous vertebrae are formed annually, like a tree's growth rings. Russian space agency says Trump paving way to seize other planets

The Russian space agency, Roscosmos, accused Donald Trump on Tuesday of creating a basis to take over other planets by signing an executive order outlining U.S. policy on commercial mining in space. The executive order, which Roscosmos said damaged the scope for international cooperation in space, was signed on Monday.