Probing Einstein’s relativity
Through the Gravity Probe B experiment, scientists developed cutting-edge technologies on the journey to test gravity.
Scientists first found evidence that general relativity was correct about four years after Einstein published his theory.
Dead stars and doomed planets
When the Sun dies, it will become a white dwarf surrounded by the decaying remnants of planets, asteroids, and comets. Astronomers are watching similar fates befall dozens of other systems in our galaxy.
Flying in Pluto’s shadow
NASA’s new airborne observatory can travel nearly anywhere, including to the elusive center of a distant planet’s shadow on Earth.
Whether on the ground or in the air, NASA’s flying observatory is a wonder to behold.
2012 — a historic year for solar eclipses
Two solar eclipses — one total and one annular — and the last transit of Venus until 2117 make this a stellar year for observers.
Find the details about the event for your location.
How robotic telescopes are changing astronomy
Automated observatories run telescopes themselves, allowing astronomers to focus on the results.
Create the ultimate observing charts for free
Professional astronomers count on two websites for vast amounts of reliable data. Now amateurs are discovering how to use them for observing.