The evening of Aug. 1 felt a lot like a birthday to NASA planetary scientist Justin Simon. On that night, Simon attended a virtual watch party for researchers preparing to use NASA's Mars 2020 ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Almost a year after ...

NASA’s OSIRIS-REx spacecraft will make its first attempt to collect a sample from asteroid Bennu on Oct. 20. Dante Lauretta, OSIRIS-REx principal investigator and a professor of planetary science and ...

Stratified random sampling is a method of sampling that divides a population into smaller groups that form the basis of test ...

A simple random sample is a subset of a statistical population where each member of the population is equally likely to be ...