Four small planets discovered around one of the closest stars to Earth—an expert explains ...
Barnard's Star is a small, dim star of the type that astronomers call red dwarfs. Consequently, even though it is one of the ...
Radioisotope generators—inside the 'nuclear batteries' that power faraway spacecraft
Powering spacecraft with solar energy may not seem like a challenge, given how intense the sun's light can feel on Earth.