Reference Pages

Filter by Category

Your Selection All Articles Countdowns Image Albums Infographics Quizzes References Wallpapers Spaceflight Human Spaceflight Private Spaceflight Science & Astronomy Search for Life Skywatching Tech Entertainment

Lunar Eclipses: What Are They & When Is the Next One?

January 21, 2019 | Reference

Lunar eclipses occur when Earth's shadow blocks the sun. There are three types; the most dramatic is a total lunar eclipse. Find out when is the next one.
Read More
2019 Full Moon Calendar

January 20, 2019 | Reference

The full moon happens once a month. Find out when.
Read More
Deep Space 1: Providing a Wealth of New Space Technology

January 17, 2019 | Reference

The primary mission for NASA's Deep Space 1 was to test out a dozen new advanced technologies. During the spacecraft's ride through space, it also swung by an asteroid and a comet.
Read More
Lunar Orbital Platform-Gateway: NASA's Proposed Lunar Space Station

January 15, 2019 | Reference

NASA's proposed Lunar Orbital Platform-Gateway is a lunar outpost that could house astronauts for months at a time, allowing them to perform advanced scientific experiments and travel into deep space.
Read More
Virgin Orbit: The Private Space Company That Aims to Launch Small Satellites

January 10, 2019 | Reference

This Virgin Galactic spin-off aims to launch hundreds of small satellites into space at once, aboard their large LauncherOne rocket.
Read More
Chelyabinsk Meteor: A Wake-Up Call for Earth

January 09, 2019 | Reference

The small asteroid that broke up over the city of Chelyabinsk, Russia, on Feb. 15, 2013, was a reminder about the importance of monitoring small bodies in space that could pose a threat to Earth.
Read More
What Are Elliptical Galaxies?

January 09, 2019 | Reference

Elliptical galaxies are dim collections of older stars, so they don't shine as brightly as spiral galaxies but they're the most common type of galaxies in the universe.
Read More
Virgin Galactic: Richard Branson's Space Tourism Company

January 09, 2019 | Reference

Entrepreneur Richard Branson aims to take paying passengers into space in the next few years.
Read More
Phoenix Mars Lander: The First Spacecraft to Taste Martian Water

January 09, 2019 | Reference

NASA's Phoenix Mars Lander was a recycled spacecraft that became the first spacecraft to sample water on Mars.
Read More
What Is a Galaxy?

January 04, 2019 | Reference

Everything you wanted to know about the basics of galaxies.
Read More