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Astronomy Picture of the Day
2026 June 28
AR 4478: Giant Sunspot Group
The Sun is pictured in yellow with surface structure. In the middle of the frame are many circuitous dark spots. The edge of the Sun is visible at the top of the image.
Image Credit & Copyright: Alfredo Vidal Pérez
Explanation: Right now, one of the largest sunspot groups in recent history is crossing the Sun. Active Region 4478 is not only big -- it's violent, showing tangled magnetic fields capable of throwing off huge clouds of particles into the Solar System. Some of these CMEs might impact the Earth. At the extreme, these solar storms could cause some Earth-orbiting satellites to malfunction, the Earth's atmosphere to slightly distort, and electrical power grids to surge. When impacting Earth's upper atmosphere, these particles can produce beautiful auroras. Pictured here, AR 4478 and its dark sunspots were captured in visible light a few days ago from Barcelona, Spain. Almost as large as AR 3664 was in 2024, the AR 4478 sunspot group is so big that it is visible just with glasses specially designed to view solar eclipses. This week, skygazing enthusiasts all over the globe will not only be tracking AR 4478 during the day -- but keenly watching night skies for its corresponding bright auroras.
Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
NASA Official: Amber Straughn
A service of: ASD at NASA / GSFC,
NASA Science Activation
& Michigan Tech. U.
Now in post production #Playback movie! 🎥
Raining buckets
Astronomy Picture of the Day
2026 June 15
Triple Shockwave from Sun Crossing Rocket
The disk of the Sun is shown with a rocket launching through it. The rising rocket shows a plume behind it and three unusual waves curve around its top tip.
Image Credit & Copyright: John Winkopp (WAI Media)
Explanation: What's happening to this Sun-crossing rocket? The SpaceX Falcon 9 rocket, visible on the upper left, launched only about one minute before this amazing image was captured. As it rose to low Earth orbit from Cape Canaveral, Florida, USA, in late May, the rocket became supersonic before it crossed the disk of the distant Sun -- from the perspective of the well-placed photographer. The spacecraft's high speed caused bow-shaped compressed-air shockwaves to form across leading surfaces, with at least three visible even outside the Sun's disk because they refract sunlight. The trailing exhaust caused turbulence visible on the lower right. None of this was damaging to the robotic Starlink 10-53 mission, which delivered 29 communications satellites to low Earth orbit as planned. And if that isn't amazing enough - the Sun had spots!
Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
NASA Official: Amber Straughn
A service of: ASD at NASA / GSFC,
NASA Science Activation
& Michigan Tech. U.
Astronomy Picture of the Day
2026 June 2
The Vela Supernova Remnant
The starfield is filled with many red nebulas, areas of dark dust, and light blue filaments.
Image Credit & Copyright: José Mtanous
Explanation: The explosion is over, but the consequences continue. About twelve thousand years ago, a relatively normal star in the constellation Vela suddenly exploded, creating a strange point of light briefly visible to humans living near the beginning of recorded history. The outer layers of the star crashed into the interstellar medium, driving a shock wave that is still visible today. The featured image, taken piecemeal over 60 hours from the Khomas Region of Namibia, captures some of that filamentary and gigantic shock in visible light, with details highlighted by hydrogen (red) and oxygen (blue) emissions. As gas flies away from the detonated star, it decays and reacts with the interstellar medium, producing light in many different colors and energy bands. Remaining at the center of the Vela Supernova Remnant is a pulsar, a star as dense as nuclear matter that spins around more than ten times in a single second.
Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
NASA Official: Amber Straughn
A service of: ASD at NASA / GSFC,
NASA Science Activation
& Michigan Tech. U.
Astronomy Picture of the Day
2026 June 1
Saturn at Night
Image Credit: NASA, JPL-Caltech, Space Science Institute, Mindaugas Macijauskas
Explanation: Telescopic views of Saturn and its beautiful rings often make it the star of star parties. But this stunning view of the outer gas gaint planet's rings and night side just isn't possible from telescopes in the vicinity of planet Earth. Peering out from the inner Solar System they can only bring Saturn's day side into view. In fact, this image of Saturn's slender sunlit crescent with the planet's night shadow cast across its broad and complex ring system was captured by the robot spacecraft Cassini. After a seven year long journey from planet Earth, Cassini called Saturn orbit home for 13 years (from 2004 - 2017) before it was directed to dive into the atmosphere of the gas giant on September 15, 2017. This magnificent mosaic is composed of frames recorded by Cassini's wide-angle camera only two days before its grand final plunge. And Saturn's night will not be seen again until another spaceship from Earth calls.
Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
NASA Official: Amber Straughn
A service of: ASD at NASA / GSFC,
NASA Science Activation
& Michigan Tech. U.
Astronomy Picture of the Day
2026 June 12
Venus and Jupiter: Conjunction from Avebury
Image Credit & Copyright: Josh Dury
Explanation: To see Venus and Jupiter together this month, you won't need binoculars or even a telescope. Just look up after sunset and you'll find them emerging as the sky grows dark near the western horizon. In fact, on June 9 the two brightest planets were in close conjunction, separated on the sky by less than 2 degrees from our perspective. Since (brighter) inner planet Venus orbits the Sun faster than outer planet Jupiter, it catches up with and passes the outer planet along the ecliptic roughly every 13 months. But every three years or so their resulting conjunction can be viewed far enough from the Sun to be easily seen in Earth's twilight skies. On June 9, the two celestial beacon's close "cosmic kiss" was captured here next to two large standing stones, the remains of a cove near the center of a 4,000 year old stone circle at Avebury, UK. Larger than Stonehenge, the Avebury henge and stone circle complex is also recognized as one of the most significant neolithic ceremonial sites on planet Earth.
Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
NASA Official: Amber Straughn
A service of: ASD at NASA / GSFC,
NASA Science Activation
& Michigan Tech. U.