astrophotography by bill w

Uranus, seventh planet from the Sun. It has the third-largest radius and fourth-largest mass in the Solar System. Uranus is similar in compo...

Neptune--eighth and farthest planet from the Sun (after Pluto’s demotion).  Along with Jupiter, Saturn and Uranus, a gas giant.  Smaller, b...

Gravitational lensing is a phenomenon predicted by einstein's general theory of relativity wherein the warp in space due to the gravita...

North America and Pelican Nebulae The North America Nebula is a huge emission nebula in Cygnus close to the bright star Deneb. It took me...

Having recently moved I've noticed some improvement in my skies from bortle white to bortle "off white".  At zenith on a good ...

finally finished the animation of the partial eclipse in hydrogen alpha. imaged over about two hours. a "usb fault" caused me ...

here's a wider view of the monster sunspot grouping i caught just before the recent partial eclipse. according to one source, this grou...