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Its surface is the most densely cratered in the Solar System — but what’s inside? Jupiter’s moon Callisto is a battered ball of dirty ice that is larger than the planet Mercury. It was visited by NASA’s Galileo spacecraft in the 1990s and 2000s, but the recently reprocessed featured image is from a flyby of […]
What created this unusual planetary nebula? Dubbed the Pillow Nebula and the Flying Carpet Nebula, NGC 7027 is one of the smallest, brightest, and most unusually shaped planetary nebulas known. Given its expansion rate, NGC 7027 first started expanding, as visible from Earth, about 600 years ago. For much of its history, the planetary nebula […]
Copyright: Marina Prol A young crescent moon can be hard to see. That’s because when the Moon shows it’s crescent phase (young or old) it can never be far from the Sun in planet Earth’s sky. And even though the sky is still bright, a slender sunlit lunar crescent is cleary visible in this early […]
Copyright: Katelyn Beecroft The diffuse hydrogen-alpha glow of emission region Sh2-27 fills this cosmic scene. The field of view spans nearly 3 degrees across the nebula-rich constellation Ophiuchus toward the central Milky Way. A Dark Veil of wispy interstellar dust clouds draped across the foreground is chiefly identified as LDN 234 and LDN 204 from […]
Copyright: Robert Eder This well-composed telescopic field of view covers over a Full Moon on the sky toward the high-flying constellation Pegasus. Of course the brighter stars show diffraction spikes, the commonly seen effect of internal supports in reflecting telescopes, and lie well within our own Milky Way galaxy. The faint but pervasive clouds of […]
That yellow spot — what is it? It’s a young planet outside our Solar System. The featured image from the Very Large Telescope in Chile surprisingly captures a distant scene much like our own Solar System’s birth, some 4.5 billion years ago. Although we can’t look into the past and see Earth’s formation directly, telescopes […]
Copyright: Andrea Girones What’s hovering above the Sun? A solar prominence. A prominence is a crest of hot gas expelled from the Sun’s surface that is held aloft by the Sun’s magnetic field. Prominences can last for days, can suddenly explode into space, or just fall back to the Sun. What decides a prominence’s fate […]
Copyright: Yousif Alqasimi & Essa Al Jasmi Sometimes even the sky surprises you. To see more stars and faint nebulosity in the Pleiades star cluster (M45), long exposures are made. Many times, less interesting items appear on the exposures that were not intended — but later edited out. These include stuck pixels, cosmic ray hits, […]
At the core of the Crab Nebula lies a city-sized, magnetized neutron star spinning 30 times a second. Known as the Crab Pulsar, it is the bright spot in the center of the gaseous swirl at the nebula’s core. About twelve light-years across, the spectacular picture frames the glowing gas, cavities and swirling filaments near […]
Copyright: How big is planet Earth’s Moon How big is planet Earth’s Moon? Compared to other moons of the Solar System, it’s number 5 on the largest to smallest ranked list, following Jupiter’s moon Ganymede, Saturn’s moon Titan, and Jovian moons Callisto and Io. Continuing the list, the Moon comes before Jupiter’s Europa and Neptune’s […]
Copyright: Kent Biggs This colorful telescopic view towards the musical northern constellation Lyra reveals the faint outer halos and brighter central ring-shaped region of M57, popularly known as the Ring Nebula. To modern astronomers M57 is a well-known planetary nebula. With a central ring about one light-year across, M57 is definitely not a planet though, […]
Copyright: Klaus Pillwatsch In this predawn skyscape recorded during the early morning hours of August 13, mostly Perseid meteors are raining down on planet Earth. You can easily identify the Perseid meteor streaks. They’re the ones with trails that seem to converge on the annual meteor shower’s radiant, a spot in the heroic constellation Perseus, […]
Copyright: Josh Dury What are those curved arcs in the sky? Meteors — specifically, meteors from this year’s Perseid meteor shower. Over the past few weeks, after the sky darkened, many images of Perseid meteors were captured separately and merged into a single frame, taken earlier. Although the meteors all traveled on straight paths, these […]
Copyright: Adam Block Over 500,000 light years across, NGC 6872 (bottom left) is a truly enormous barred spiral galaxy. At least 5 times the size of our own large Milky Way, NGC 6872 is the largest known spiral galaxy. About 200 million light-years distant toward the southern constellation Pavo, the Peacock, the appearance of this […]
This galaxy is not only pretty — it’s useful. A gorgeous spiral some 100 million light-years distant, NGC 1309 lies on the banks of the constellation of the River (Eridanus). NGC 1309 spans about 30,000 light-years, making it about one third the size of our larger Milky Way galaxy. Bluish clusters of young stars and […]
