**Astronomy Picture of the Day** 02 May 2026 **Seeing Titan** Image: Image Credit: VIMS Team, Univ. Arizona , U. Nantes , ESA , NASA Shrouded in a thick atmosphere, the surface of Saturn's largest moon, Titan , is really hard to see. Small particles suspended in Titan's upper atmosphere cause an almost impenetrable haze, strongly scattering light at visible wavelengths and hiding surface features from prying eyes. Still, Titan's surface is better imaged at infrared wavelengths, where scattering is weaker and atmospheric absorption is reduced. Arrayed around this visible light image (center) of Titan are some of the clearest global infrared views of the tantalizing moon so far. In false color, the six panels present a consistent processing of 13 years of infrared image data from the Visual and Infrared Mapping Spectrometer (VIMS) on board the Cassini spacecraft orbiting Saturn from 2004 to 2017. They offer a stunning comparison with Cassini's visible light view. NASA's revolutionary rotorcraft mission to Titan's surface is due to launch no earlier than July, 2028. #APOD #Titan #Saturn #Cassini #VIMS #InfraredAstronomy https://apod.nasa.gov/apod/ap260502.html

**Astronomy Picture of the Day** 01 May 2026 **Markarian's Chain** Image: Credit: Not provided Near the heart of the Virgo Galaxy Cluster , a string of galaxies known as Markarian's Chain stretches across this telescopic field of view. Anchored in the frame at bottom right by prominent lenticular galaxies, M84 (bottom) and M86 , you can follow the chain's gentle arc up and toward the left. Near center you'll spot the pair of interacting galaxies NGC 4438 and NGC 4435, known to some as Markarian's Eyes . An estimated 50 million light-years distant, the Virgo Cluster itself is the nearest galaxy cluster . With up to about 2,000 member galaxies, it has a noticeable gravitational influence on our own Local Group of Galaxies . Within the Virgo Cluster at least seven galaxies in Markarian's Chain appear to move coherently , while others may appear to be part of the chain by chance. #APOD #MarkarianChain #VirgoCluster #GalaxyCluster #M84 #M86 https://apod.nasa.gov/apod/ap260501.html

**Astronomy Picture of the Day** 30 April 2026 **Waves on Titan** Image: Video Credit: Una Schneck Text: Cecilia Chirenti ( NASA GSFC , UMCP , CRESST II ) Have you ever thought about surfing on an alien world? We can now expand the search for the perfect wave from Earth to the rest of the Solar System, and beyond . Scientists have developed a new model for simulating waves on other planets . Titan is one of the 274 confirmed moons of Saturn to date, and the only object in the solar system (besides Earth) known to have liquid lakes and seas on its surface. The featured video shows a simulation of waves on Earth (right) and on Titan (left), under the same conditions (the scale marker is in meters). A light breeze would create taller, slower-moving waves on Titan than on Earth, because the lakes there are filled with light liquid hydrocarbons , and because of Titan's low gravity and higher atmospheric pressure. In a couple of years, NASA expects to launch the Dragonfly mission, which will travel for 6 years and send a rotorcraft to explore Titan and study its microbial habitability . #APOD #Titan #Saturn #Moons #PlanetaryScience #AstroPhysics https://apod.nasa.gov/apod/ap260430.html

**Astronomy Picture of the Day** 25 April 2026 **Young Moon and Sister Stars** Image Credit: Giorgia Hofer Explanation: Sunlit arms of a crescent moon seem to embrace the faint lunar night side in this dramatic celestial view from planet Earth. The single telephoto exposure tracking the sky was captured on the night of April 19, when a two day old Moon was near perigee in its elliptical orbit. On that date, the young Moon was also close on the sky to the lovely Pleiades Star Cluster. With the moonlight dimmed by clouds the Pleiades sister stars gather below the Moon's bright crescent, seen through a faint but colorful lunar corona. The lunar night side is illuminated by earthshine, sunlight reflected from the Earth itself. The Moon's ashen glow, also known as the "old moon in the young moon's arms," tends to be bright in the northern hemisphere spring. And for now, the Moon's orbit takes it near the Pleiades stars each month in planet Earth's sky, though their close conjunctions are easiest to see when the Moon is near a crescent phase. #APOD #YoungMoon #Pleiades #Moonlight #Earthshine #CrescentMoon https://apod.nasa.gov/apod/ap260424.html

**Astronomy Picture of the Day** 23 April 2026 **Large Scale Structure of the Universe** Image Credit: Claire Lamman, DESI collaboration, Cecilia Chirenti, NASA, GSFC, CRESST II Explanation: This is a map of the universe. The Dark Energy Spectroscopic Instrument (DESI) at Kitt Peak National Observatory, Arizona, has finished its five-year survey. It observed more than 47 million galaxies and quasars and created a 3D map centered on the Earth. Today's featured image shows a thin slice of these data: the black gaps indicate where our Galaxy obscures distant objects. The feathery web in the inset shows the large scale structure of the universe. Light of the most distant galaxies shown here travelled for 11 billion years to reach the Earth. Galaxies cluster throughout cosmic history under the competing influences of gravity and dark energy, responsible for the accelerated expansion of the universe. Analysis of early DESI results hinted at the possibility that dark energy, described as a cosmological constant by Albert Einstein, may not be constant after all. But we still have to wait for the analysis of the now complete dataset. The nature of dark energy is the biggest mystery of cosmology. #APOD #LargeScaleStructure #Universe #CosmicWeb #DESI #DarkEnergy https://apod.nasa.gov/apod/ap260423.html

**Astronomy Picture of the Day** 22 April 2026 **Three Sky Arches over Snowy Alps** Image Credit: Angel Fux Explanation: Why are there three arches across the sky instead of two? Last month, after being dropped off by a helicopter at a high mountain peak in the Alps near the Swiss Italian border, an adventurous astrophotographer expected two arches of our Milky Way galaxy to be visible during the night. These were the inner arch looking in toward the center of our galaxy on the left, visible just before sunrise, and the outer arch on the right visible just after sunset. But there were three arches. The surprised astrophotographer soon realized that the sky was so dark that an entire arc of faint zodiacal light was also noticeable -- sunlight scattered by inner Solar System dust. And it artfully connected the two Milky Way arches! The next morning a helicopter picked the astrophotographer back up, and after 40 hours of processing and combining that night's images, the featured triple-arch 360-degree panorama resulted. #APOD #Astronomy #AstronomyCommunity #SkyArch #ArchesOfTheSky #AtmosphericPhysics https://apod.nasa.gov/apod/ap260421.html

**Astronomy Picture of the Day** 21 April 2026 **Comet R3 PanSTARRS over a Himalayan Valley** Image Credit: Basudeb Chakrabarti, Samit Saha Explanation: The best way to see comet R3 PanSTARRS’s long tail is with a camera. This week, the recently brightened comet appears in northern skies to the east just before dawn, but is only barely visible to the unaided eye. The many-degree ion tail captured on long duration camera exposures is not unusual for a comet - it is primarily due to the Earth's nearly sideways view of the tail as it points away from the Sun. In the featured image taken last week, Comet C/2025 R3 (PanSTARRS) showed off its flowing tail through a valley between two peaks in the Himalayan mountains of India.   The comet passed its closest to the Sun yesterday. As it nears its closest approach to Earth next week, a bushy dust tail may become visible. The comet is slowly moving out of northern skies and by the end of the month will be visible after sunset in southern skies as it fades and leaves our Solar System.  #APOD #CometR3 #PanSTARRS #C2025R3 #HimalayanValley #NorthernSkies https://apod.nasa.gov/apod/ap260420.html

**Astronomy Picture of the Day** 20 April 2026 **Eye on the Milky Way** Image Credit: Miguel Claro, TWAN, Dark Sky Alqueva Explanation: Have you ever had stars in your eyes? It appears that the eye on the left does, and moreover, it appears to be gazing at even more stars. The featured 27-frame mosaic was taken in 2019 from Ojas de Salar in the Atacama Desert of Chile. The eye is actually a small lagoon captured reflecting the dark night sky as the Milky Way Galaxy arched overhead. The seemingly smooth band of the Milky Way is really composed of billions of stars, but decorated with filaments of light-absorbing dust and red-glowing nebulas. Additionally, both Jupiter (slightly left the galactic arch) and Saturn (slightly to the right) are visible. The lights of small towns dot the unusual vertical horizon. The rocky terrain around the lagoon appears to some more like the surface of Mars than our Earth. #APOD #MilkyWay #Galaxy #Astronomy #Space #Stars https://apod.nasa.gov/apod/ap260419.html

**Astronomy Picture of the Day** 19 April 2026 **PanSTARRS and Planets** Image Credit: Luc Perrot, TWAN Explanation: Near the eastern horizon before sunrise, Comet C/2025 R3 PanSTARRS is getting brighter. Readily visible in binoculars and small telescopes, the comet may be just on the verge of naked-eye visibility from dark sky sites. Though it was not quite apparent to the eye, PanSTARRS is still easy to spot in this camera image taken on April 16. In the view from a volcanic peak overlooking France's Reunion Island, planet Earth, the comet shares eastern predawn skies with naked-eye planets Mars and Mercury and fainter Neptune. Saturn is hiding behind the low cloudbank that doesn't quite hide an old crescent Moon. This is a good weekend for northern hemisphere comet watchers to try to catch PanSTARRS an hour or so before sunrise, as the comet grows brighter approaching its perihelion on April 19. On April 26 the comet makes its closest approach to our fair planet but by then will be difficult to see in the solar glare. Good views of this comet PanSTARRS in late April and early May will be from the southern hemisphere. #APOD #PanSTARRS #CometC2025R3 #CometWatch #CelestialEvents #NightSky https://apod.nasa.gov/apod/ap260418.html

**Astronomy Picture of the Day** 17 April 2026 **M82: Starburst Galaxy with a Superwind** Image Credit: Arnaud Malleval Explanation: Messier 82 is a starburst galaxy with a superwind. In fact, through supernova explosions and powerful winds from massive stars, the burst of star formation in M82 is driving a prodigious outflow. Evidence for the superwind from the galaxy's central regions is clear in the sharp telescopic portrait. The composite image includes 33 hours of narrowband data, highlighting emission from long outflow filaments of atomic hydrogen gas in reddish hues. Some of the gas in the superwind, enriched in heavy elements forged in the massive stars, will eventually escape into intergalactic space. Triggered by a close encounter with nearby large galaxy M81, the furious burst of star formation in M82 should last about 100 million years or so. Also known as the Cigar Galaxy for its elongated visual appearance, M82 is about 30,000 light-years across. It lies 12 million light-years away near the northern boundary of Ursa Major. #APOD #M82 #Messier82 #StarburstGalaxy #Superwind #GalacticOutflow https://apod.nasa.gov/apod/ap260417.html