APOD: 2023 December 18 Б The Same Color Illusion
18.12.2023

Are squares A and B the same color? They are! To verify this, either run your cursor over the image or click here to see them connected. The featured illusion, an example...

A Red Dome Under the Big Dipper
21.08.2007

Why would the dome of a telescopic observatory appear translucent red? As one of the telescopes of the Etscorn Observatory of New Mexico Tech waited to inspect small portions of the night sky, playful observers decided to make this unusual image.

Antares and Clouds
17.04.2012

Antares is a huge star. In a class called red supergiant, Antares is about 850 times the diameter of our own Sun, 15 times more massive, and 10,000 times brighter. Antares is the brightest star in the constellation of Scorpius and one of the brighter stars in all the night sky.

Little Planet South Pole
26.08.2022

Lights play around the horizon of this snowy little planet as it drifts through a starry night sky. Of course the little planet is actually planet Earth. Recorded on August 21, the digitally warped, nadir centered panorama covers nearly 360x180 degrees outside the Amundsen-Scott South Pole Station, Antarctica.

Reflections of Venus and Moon
19.05.2018

Posing near the western horizon, a brilliant evening star and slender young crescent shared reflections in a calm sea last Thursday after sunset. Recorded in this snapshot from the Atlantic beach at Santa Marinella...

Space Station in the Sun
24.05.2008

Still bathed in sunlight, the International Space Station tracked through night skies above Hombressen, Germany on May 12. From a range of at least 360 kilometers, astronomer Dirk Ewers was able to record...

Z is for Mars
22.04.2006

This composite of images spaced about a week apart - from late July 2005 (bottom right) through February 2006 (top left) - traces the retrograde motion of ruddy-colored Mars through planet Earth's night sky. On November 7th, 2005 the Red Planet was opposite the Sun in Earth's sky (at opposition).

Meteors vs Supermoon
16.12.2016

Geminid meteors battled supermoonlight in planet Earth's night skies on December 13/14. Traveling at 35 kilometers (22 miles) per second, the bits of dust from the mysterious asteroid 3200 Phaethon that produce the meteor streaks are faster than a speeding bullet.

A Lenticular Cloud Over New Zealand
21.01.2009

What's happening above those mountains? Several clouds are stacked up into one striking lenticular cloud. Normally, air moves much more horizontally than it does vertically. Sometimes, however, such as when wind comes off of a mountain or a hill, relatively strong vertical oscillations take place as the air stabilizes.

From the Galactic Plane through Antares
2.07.2018

Behold one of the most photogenic regions of the night sky, captured impressively. Featured, the band of our Milky Way Galaxy runs diagonally along the far left, while the colorful Rho Ophiuchus region including...