Contributor Posts

NASA Astronomy Picture of the Day:

Have you ever seen the Pleiades star cluster? Even if you have, you probably have never seen it as large and clear as this. Perhaps the most famous star cluster on the sky, the bright stars of the Pleiades can be seen with the unaided eye even from the depths of a light-polluted city. With a long exposure from a dark location, though, the dust cloud surrounding the Pleiades star cluster becomes very evident. The featured 23-hour exposure, taken from Fagagna, Italy covers a sky area several times the size of the full moon. Also known as the Seven Sisters and M45, the Pleiades lies about 400 light years away toward the constellation of the Bull (Taurus). A common legend with a modern twist is that one of the brighter stars faded since the cluster was named, leaving only six of the sister stars visible to the unaided eye. The actual number of Pleiades stars visible, however, may be more or less than seven, depending on the darkness of the surrounding sky and the clarity of the observer's eyesight. New: Alternative multi-APOD front page

Photo by Francesco Pelizzo

Common crab spider (Xysticus cristatus) female with prey Carniolan honey bee (Apis melifera carnica), a subspecies of the western honey bee. Near Bled, Slovenia.

Charles J. Sharp, CC BY-SA 4.0, via Wikimedia Commons. View source.

George Santayana - (1863 – 1952)  ~ Jorge Agustín Nicolás Ruiz de Santayana y Borrás, was a philosopher, essayist, poet, critic and novelist. Born in Spain and raised and educated in the US from the age of eight. He left his position at Harvard at the age of 48 and returned to Europe permanently. Santayana was the author of many books and known for his aphorisms. He was profoundly influenced by Spinoza's life and thought. Although he was an atheist, he treasured the Spanish Catholic values, practices, and worldview in which he was raised. 

NASA Astronomy Picture of the Day:

Are Saturn's auroras like Earth's? To help answer this question, the Hubble Space Telescope and the Cassini spacecraft monitored Saturn's North Pole simultaneously during Cassini's final orbits around the gas giant in September 2017. During this time, Saturn's tilt caused its North Pole to be clearly visible from Earth. The featured image is a composite of ultraviolet images of auroras and optical images of Saturn's clouds and rings, all taken by Hubble. Like on Earth, Saturn's northern auroras can make total or partial rings around the pole. Unlike on Earth, however, Saturn's auroras are frequently spirals -- and more likely to peak in brightness just before midnight and dawn. In contrast to Jupiter's auroras, Saturn's auroras appear better related to connecting Saturn's internal magnetic field to the nearby, variable, solar wind. Saturn's southern auroras were similarly imaged back in 2004 when the planet's South Pole was clearly visible to Earth. Your Sky Surprise: What picture did APOD feature on your birthday? (post 1995)

Windows of the octagonal pavilion (Hakkakutei) at Shitennō-ji Honbō Park, Osaka, Japan.

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

NASA Astronomy Picture of the Day:

You might not think a close up view of rocket engines producing 8.8 million pounds of thrust would be relaxing, but here it can be. In fact, you can get a warm and cozy feeling just spending a few moments watching NASA's holiday rocket engine fireplace. The video features a loop of the Space Launch System rocket's RS-25 main engines throttled up and running flanked by solid rocket boosters and framed by a stone fireplace. The accompanying audio track mixes the drastically muted sounds of the rocket engines firing with the more familiar sounds of a burning, crackling wood fire. AI elements are included in the composed video along with an image and logo from the Artemis I mission. The Artemis I uncrewed mission to the Moon and back again launched in November 2022 on a Space Launch System rocket.

Christmas lights on the Champs-Élysées Avenue in Paris (France) in 2020.

Pierre Blaché from Paris, France, CC0, via Wikimedia Commons. View source.

NASA Astronomy Picture of the Day:

Colorful and bright, this streaking fireball meteor was captured in a single exposure taken at Purple Mountain (Tsuchinshan) Observatory’s Xuyi Station in 2020, during planet Earth's annual Perseid meteor shower. The dome in the foreground houses the China Near Earth Object Survey Telescope (CNEOST), the largest multi-purpose Schmidt telescope in China. Located in Xuyi County, Jiangsu Province, the station began its operation as an extension of China's Purple Mountain Observatory in 2006. Darling of planet Earth's night skies in 2024, the bright comet designated Tsuchinshan-ATLAS (C/2023 A3) was discovered in images taken there on 2023 January 9. The discovery is jointly credited to NASA's ATLAS robotic survey telescope at Sutherland Observatory, South Africa. Other comet discoveries associated with the historic Purple Mountain Observatory and bearing the observatory's transliterated Mandarin name include periodic comets 60/P Tsuchinshan and 62/P Tsuchinshan.

Photo by Purple Mountain (Tsuchinshan)

Eurasian brown bear (Ursus arctos arctos) female, near Stari Kot, Slovenia.

Charles J. Sharp, CC BY-SA 4.0, via Wikimedia Commons. View source.