Life as we know it developed on a planet orbiting a G2 V star, the Sun. The cryptic “G2 V” designation is the Sun’s “spectral type.” Based on a star’s spectrum, astronomers group stars by temperature.

The life cycle for a particular star depends on its size. The diagram shows the life cycles of stars that are: about the same size as the Sun; far greater than the Sun in size. All stars begin ...

And, like John Wall, Alexander Ovechkin and Bryce Harper have done, she has to adjust to life as a star in Washington. “It’s been an unreal day,” Delle Donne said during her introductory ...