Contributor Posts

Belle Tout lighthouse and chalk cliffs by the English Channel. Captain Matthew Webb made the first observed and unassisted swim across the channel, reaching France on 25 August 1875.

kallerna, CC BY-SA 4.0, via Wikimedia Commons. View source.

NASA Astronomy Picture of the Day:

Comet 220P is unexpectedly bright. Normally, periodic Comet 220P/McNaught is so dim that to see it requires a telescope. Two surprising outbursts this year, however, have made it about 20,000 times brighter than usual, so that it is now visible with binoculars and long-duration camera exposures. As expected, Comet 220P continues to orbit the Sun between Mars and Jupiter with a period of over 5 years. The featured long duration exposure, taken 10 days ago from South Africa, shows the comet's bright green head and short dust tail. Reasons for Comet 220P's impressive outbursts are unknown but could be caused by the release of built-up subsurface gas or comet quakes. Comet 220P will pass about one Earth-Sun distance from the Earth in October, after which it is expected to fade quickly as it begins its return to the far part of its orbit. APOD's main NASA site is moving : From apod.nasa.gov to science.nasa.gov/apod

Photo by Spilios Asimakopoulos

Stipa – the symbol of the Tarutyns'kyj steppe. Today is the Independence Day of Ukraine.

Максим Яковлєв, CC BY-SA 4.0, via Wikimedia Commons. View source.

NASA Astronomy Picture of the Day:

What would it look like to approach the grand planet Saturn? One doesn't have to just imagine -- the Cassini spacecraft did just this in 2004, recording thousands of images along the way, and hundreds of thousands more since entering orbit. Some of Cassini's early images have been digitally tweaked, cropped, and compiled into the featured inspiring video which is part of a larger IMAX movie project named In Saturn's Rings. In the concluding sequence, Saturn looms increasingly large on approach as cloudy Titan swoops below. With Saturn whirling around in the background, Cassini is next depicted flying over Mimas, with large Herschel Crater clearly visible. Saturn's majestic rings then take over the show as Cassini crosses Saturn's thin ring plane. Dark shadows of the ring appear on Saturn itself. Finally, the enigmatic ice-geyser moon Enceladus appears in the distance and then is approached just as the video clip ends. After more than a decade of exploration and discovery, the Cassini spacecraft ran low on fuel in 2017 was directed to enter Saturn's atmosphere, where it surely melted. APOD's main NASA site is moving : From apod.nasa.gov to science.nasa.gov/apod

Video by Cassini Imaging Team, ISS, JPL, NASA, ESA, S. Van Vuuren et al.; Music: Adagio for Strings (NY Philharmonic)

Hyacinth macaw (Anodorhynchus hyacinthinus) in flight in Mato Grosso, Brazil.

Giles Laurent, CC BY-SA 4.0, via Wikimedia Commons. View source.

NASA Astronomy Picture of the Day:

Recorded the night of August 12-13, images from four dedicated meteor-monitoring cameras at an astronomical observatory in Czechia were aligned and combined to create this all-night, all-sky view. On that night, the total count came to 1,706 meteors. And since that coincided with the peak activity of the 2026 Perseid Meteor Shower, most are perseids. Their overwhelming numbers make them easy to spot. Quite convincingly, perseid trails all trace back to a single radiant on the sky at the upper right, a region in the annual shower's eponymous constellation Perseus. But meteors belonging to other much less active showers can also revealed by finding their radiants too. For example, seen crossing the perseid trails are meteors from a shower whose radiant lies in Cygnus, known as Kappa Cygnids. The antihelion complex, a general region near Aquarius and opposite the Sun in the sky, is also identifiable as a weak source for meteors.

Photo by Valašské Meziříčí Observatory

SBB Ce 6/8 II 14253 "crocodile" electric locomotive with the Gotthard mountain route experience train 31066 Lavorgo - Erstfeld crosses the lower Wattingen bridge near Wassen, Switzerland.

Kabelleger, CC BY-SA 4.0, via Wikimedia Commons. View source.