JF flew about 199,000 miles (320,000 km) away from Earth. It's estimated size is about 34 feet wide (10 meters), roughly the ...

This has enabled us to make an attempt at mapping the planet over the last 40% of its history, which you can see in the ...

Light speed is the fastest that any material object can travel through space. That is ... How fast light travels relative to Earth One of O'Donoghue's first animations shows how fast light ...