Pluto’s Planetary Problem
Fifteen years ago, every child was taught that there are nine planets in the solar system: Mercury, Venus, Mars, Earth, Jupiter, Saturn, Uranus, Neptune and Pluto. The status of the planets remained largely...
Our Universe May Not Be Alone
In 1922, Edwin Hubble shocked the scientific community when he discovered that the universe extended beyond the Milky Way. One realization — that hundreds of billions of other galaxies existed — seemed to...