The method is commonly used in statistics, a branch of applied mathematics, to obtain a sample that is representative of the larger population. The simple random sampling method allows researchers ...

Rocket Lab's MSR study involves two Neutron launches of a sample retrieval lander and Earth return orbiter. Credit: Rocket Lab WASHINGTON — NASA has awarded a contract to Rocket Lab to study ...

NASA's troubled Mars sample-return program may have a new lifeline, in the form of a proposal from private space company Rocket Lab to help save the mission. When the Perseverance rover landed on ...

Visitors enjoy the scenery at Dulaan Holiday Wine Stroll in the Ningxia Hui autonomous region on Oct 4. [Photo/Xinhua] YINCHUAN — Nestled at the eastern foothill of the Helan Mountains in the ...