12. THERE WAS A 10TH PLANET.
Hubble is good for more than studying exoplanets, moons, and baby galaxies. Scientists have used the space telescope to study strange new planets in our own solar system. Before the International Astronomical Union meddled with the definition of “planet,” a tenth planet in the solar system—Eris—was discovered. The secrets of Eris, a Kuiper Belt Object that is now categorized as the second-largest dwarf planet (behind Pluto), were unlocked by Hubble, including its size and mass.
13. THERE IS SUCH A THING AS CLUMPY DARK MATTER.
Thanks to Hubble, scientists have been able to map dark matter in the universe, and have worked out that normal matter (things made of atoms—in this case, galaxies) gathers near dense areas of dark matter. In addition, Hubble’s findings suggest that “dark matter has grown increasingly ‘clumpy’ as it collapses under gravity.” NASA comparesHubble’s success in mapping dark matter to “mapping a city from nighttime aerial snapshots showing only streetlights. … These new map images are equivalent to seeing a city, its suburbs and country roads in daylight for the first time.”