Astro Information

The grand spiral galaxy NGC 3344 presents its full face to Earth, a 40,000-light-year-wide cosmic pinwheel in Leo Minor just 20 million light-years away. This Hubble Space Telescope multispectral close-up—spanning ultraviolet to near-infrared wavelengths—reveals exquisite details across 15,000 light-years of its central region, laying bare the galaxy’s lifecycle in living color.

NGC 6302, a planetary nebula nicknamed the "Butterfly Nebula," lives up to its floral-insect moniker with wing-like gas plumes spanning 3 light-years. Located 4,000 light-years away in Scorpius, this stellar corpse showcases the dramatic final act of a massive star—now a 250,000°C central star evolving into a white dwarf, its ultraviolet radiation ionizing the surrounding nebula into a kaleidoscopic display.

The historic Savudrija Lighthouse shines along the northern coast of Istria Peninsula in this masterful night-sky composition. Built in the early 19th century, the beacon has guided Adriatic sailors for centuries, its beam contrasting with the ancient navigational icon above: Polaris, the North Star. In the image, Alpha Ursae Minoris traces the shortest arc around the North Celestial Pole—the cosmic pivot of Earth’s axis—at the center of concentric star trails.

These ethereal wisps are the last observable remains of a star that perished in a supernova explosion ~7,000 years ago, giving birth to the Veil Nebula. When the star detonated, its expanding gas cloud shone as brightly as a crescent Moon, lingering in Earth’s sky for weeks during humanity’s prehistoric era. Today, this supernova remnant—known as the Cygnus Loop—has faded, visible only through small telescopes pointed at the constellation Cygnus.

What’s happening to this spiral galaxy? The answer lies in its violent tango with a neighboring dwarf galaxy. At the center of this image, UGC 1810 forms the Arp 273 galaxy pair with its collision partner, showcasing a cosmic drama where gravity reshapes stellar landscapes. The most striking feature—UGC 1810’s outer blue ring—betrays the chaos of their gravitational battle, while the smaller companion galaxy appears distorted in the embrace.

While grand spiral galaxies steal the limelight with symmetric arms and glowing star nurseries, the irregular dwarf galaxy Sextans A weaves its own stellar saga in the cosmic periphery. Just 5,000 light-years across, this galaxy hosts young star clusters and star-forming regions like amber-like clumps suspended in space, blooming 4.5 million light-years away in the constellation Sextans. As a sentinel on the Local Group’s fringe, it stands distant from the galactic family including the Andromeda Galaxy and the Milky Way.

Resembling a double-bladed lightsaber, this stunning Hubble Space Telescope image captures Herbig-Haro 24 (HH 24)—a half-light-year-wide jet erupting from a newborn star in the Orion B molecular cloud complex, ~1,300 light-years (400 parsecs) from Earth. HH 24 exemplifies the violent beauty of star birth, where invisible forces carve luminous pathways through interstellar space.

Stargazers and astrophotographers alike hail this deep-sky masterpiece as the Milky Way’s most stunning portrait. The image anchors viewers with a diagonally streaming galactic band in the lower-left, intersecting the vibrant Rho Ophiuchi Nebula at its center. Above, the dazzling red nebula of Zeta Ophiuchi floats like a cosmic flame, creating a triad of celestial wonders.

In this infrared portrait from the James Webb Space Telescope, the core of spiral galaxy NGC 2566 reveals cosmic mysteries—starting with the eight radiating spikes at its center, which aren’t astrophysical features but diffraction spikes from the telescope’s support structure. Though the bright core shows no signs of active galactic nuclei, dynamical calculations suggest a supermassive black hole of millions of solar masses lurks within, currently in a low-activity state.

NASA’s Juno spacecraft, on its highly elliptical orbit around Jupiter, has completed over 70 close flybys, revealing the gas giant’s secrets. A 2017 image captured from below Jupiter’s equator shows horizontal cloud bands transforming into spectacular swirling vortices and intricate patterns, with a "string of pearls" array of white oval cloud formations near the equator. These views challenge all prior conceptions of Jupiter’s atmospheric dynamics.

While most globular clusters orbit in the Milky Way’s outer halo, NGC 6366 stands out by lingering close to the galactic plane. Located ~12,000 light-years from Earth in Ophiuchus, the cluster’s starlight dims and reddens as it passes through interstellar dust—a phenomenon known as interstellar reddening. In this telescope image, NGC 6366’s golden stellar swarm contrasts sharply with the blue-white star 47 Ophiuchi, just 100 light-years away and visible as a bright point near the cluster’s edge.

The bright spiral galaxy M63 (NGC 5055) shines in the northern sky, a mere 30 million light-years from Earth in the constellation Canes Venatici ("the Hunting Dogs"). Spanning ~100,000 light-years—comparable to the Milky Way—its luminous core and grand spiral arms earned it the nickname "Sunflower Galaxy," a nod to its petal-like structure in deep exposures.

When the International Space Station (ISS) streaks across the Sun’s disk at 8 km/s, its 0.8-second transit freezes human ingenuity and stellar dynamics on the same cosmic canvas. This rare phenomenon defies the ISS’s usual visibility—typically a bright speck in twilight—occurring only when orbital mechanics align the station, Earth, and Sun with precision.

On a clear, moonless night, a faint band stretches across the sky, gradually resolving into a luminous ribbon as eyes adjust to the dark. This is no ordinary sight: it’s the Milky Way, a grand projection of our galaxy’s 千亿 stars. The galactic plane arcs elegantly across the frame, flanked by the colorful Rho Ophiuchi Nebula on the right and the red-ringed Zeta Ophiuchi Nebula at the top center. Taken in late February from Mauna Kea, Hawaii, the image features the University of Hawaii’s 2.2-meter telescope in the foreground—though you don’t need a volcanic summit to witness this cosmic wonder.

A close-up from NASA’s Mars Reconnaissance Orbiter (MRO) HiRISE camera unveils the weathered craters and aeolian features of southern Acidalia Planitia. While standard HiRISE imagery often appears in striking blue tones—a result of multispectral processing to enhance geological details—the region would likely appear gray or pale red to human eyes. Of course, no human has yet witnessed this Martian landscape firsthand—unless we count Andy Weir’s fictional NASA astronaut in The Martian.

Neptune, named after the Roman god of the sea, "Neptunus," stands as the eighth and farthest major planet from the Sun. This celestial body, discovered in 1846, captivates astronomers and enthusiasts alike with its intense blue hue and powerful atmospheric dynamics, earning its reputation as a distant, majestic sentinel of the solar system.