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Astronomy Picture Of the Day (APOD)
APOD: 2025 May 9 Б IXPE Explores a Black Hole Jet
9.05.2025
How do black holes create X-rays? Answering this long-standing question was significantly advanced recently with data taken by NASAБs IXPE satellite. X-rays cannot exit a black hole, but they can be created in the energetic environment nearby, in particular by a jet of particles moving outward.
M1: The Incredible Expanding Crab
8.05.2025
Cataloged as M1, the Crab Nebula is the first on Charles Messier's famous list of things which are not comets. In fact, the Crab Nebula is now known to be a supernova remnant, an expanding cloud of debris from the death explosion of a massive star.
APOD: 2025 May 7 Б Galaxy Wars: M81 versus M82
7.05.2025
In the upper left corner, surrounded by blue arms and dotted with red nebulas, is spiral galaxy M81. In the lower right corner, marked by a light central line and surrounded by red glowing gas, is irregular galaxy M82.
APOD: 2025 May 6 Б The Doubly Warped World of Binary Black Holes
6.05.2025
If one black hole looks strange, what about two? Light rays from accretion disks around a pair of orbiting supermassive black holes make their way through the warped space-time produced by extreme gravity in this detailed computer visualization.
APOD: 2025 May 5 Б Planet Lines Across Water
5.05.2025
WhatБs causing those lines? Objects in the sky sometimes appear reflected as lines across water Б but why? If the waterБs surface is smooth, then reflected objects would appear similarly -- as spots.
APOD: 2025 May 4 Б Spin up of a Supermassive Black Hole
4.05.2025
How fast can a black hole spin? If any object made of regular matter spins too fast -- it breaks apart. But a black hole might not be able to break apart -- and its maximum spin rate is really unknown.
Titan: Moon over Saturn
3.05.2025
Like Earth's moon, Saturn's largest moon Titan is locked in synchronous rotation with its planet. This mosaic of images recorded by the Cassini spacecraft in May of 2012 shows its anti-Saturn side, the side always facing away from the ringed gas giant.
Young Star Cluster NGC 346
2.05.2025
The most massive young star cluster in the Small Magellanic Cloud is NGC 346, embedded in our small satellite galaxy's largest star forming region some 210,000 light-years distant. Of course the massive stars of NGC 346 are short lived, but very energetic.
MESSENGER s Last Day on Mercury
1.05.2025
The first to orbit inner planet Mercury, the MESSENGER spacecraft came to rest on this region of Mercury's surface on April 30, 2015. Constructed from MESSENGER image and laser altimeter data, the projected scene looks north over the northeastern rim of the broad, lava filled Shakespeare basin.
APOD: 2025 April 30 Б A Happy Sky over Bufa Hill in Mexico
30.04.2025
Sometimes, the sky itself seems to smile. A few days ago, visible over much of the world, an unusual superposition of our Moon with the planets Venus and Saturn created just such an iconic facial expression.
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