The International Astronomical Union defines a planet as a celestial body that orbits the sun, is massive enough that gravity has forced it into a spherical shape, and has cleared away other objects ...

The universe has quasi-moons, mini-moons, and moonlets, but no official definition of what counts as a moon.

The Clinton administration has published a new policy that defines scientific misconduct and describes how universities should investigate it. The policy offers clarifications but no major changes ...

When someone says the word embryo, what do you think of? Probably that picture you’ve seen a thousand times on a thousand different news articles: a translucent orb swelling with cytoplasm being ...