Eris: The First Dwarf Planet By Nola Taylor Redd The discovery of Eris led to Pluto's demotion to dwarf planet.
Uranus: The Ringed Planet That Sits on its Side By Charles Q. Choi Uranus is the seventh planet from the sun and was the first to be discovered.
Ed White: The First American to Walk in Space By Tim Childers Ed White, the first American to walk in space, was a pioneer of human spaceflight.
Solar Eclipses: When Is the Next One? By Joe Rao Solar eclipses are one of nature’s grandest events. What is a solar eclipse? Why are there different kinds of solar eclipses? How do they work? And when is the next one? We explain.
The Wright Brothers and the First Airplane Flight By Elizabeth Howell The Wright Brothers’ first plane flight in Kitty Hawk lasted just 12 seconds in 1903, but Orville and Wilbur made history with their Wright Flyer.
The First Flight: Wright Flyer By Jeremy Hsu The 1903 Wright Flyer that made history's first flight was a relatively simple machine with propellers and wire controls.
Charles Lindbergh and the First Solo Transatlantic Flight By Nola Taylor Redd "Lucky Lindy" electrified the world and changed public opinion about air travel.
Vera Rubin: The Astronomer Who Brought Dark Matter to Light By Tim Childers Vera Rubin's discoveries showed that our universe is much more mysterious than anyone imagined.
New Horizons: Exploring Pluto and Beyond By Elizabeth Howell The New Horizons spacecraft reached the dwarf planet Pluto in July 2015.
White Holes: Black Holes' Neglected Twins By Charlie Wood You've heard of black holes, but what about their inverted twins — white holes?
Red Dwarfs: The Most Common and Longest-Lived Stars By Nola Taylor Redd Most of the star nearest to Earth are red dwarfs, but they are too dim to be seen with the naked eye.
What Is the Grandfather Paradox? By Greg Uyeno If time travel is possible, it must avoid the contradiction of the grandfather paradox.
What Are Skyrmions? By Adam Mann Skyrmions are simple. They're just itty-bitty nano-magnetic vortices.
What Is a Light-Year? By Tim Childers Light-years make measuring astronomical distances a bit more manageable.
Stratolaunch Systems: Building the World's Largest Airplane By Adam Mann Stratolaunch is the builder of the world's first megaplane.
Saturn: Facts About the Ringed Planet By Charles Q. Choi Learn about the physical characteristics of Saturn and its famous rings, what we know about Saturn’s moons and Saturn’s roots in Greek mythology.
Apollo 11: First Men on the Moon By Nola Taylor Redd Apollo 11 astronauts were the first to leave footprints on the moon.
The First Space Shuttle Flight Into Space By Nola Taylor Redd The first launch of the space shuttle Columbia touched off a new era in space flight.
