Contributor Posts

NASA Astronomy Picture of the Day:

It came from outer space. An object from outside our Solar System is now passing through at high speed. Classified as a comet because of its gaseous coma, 3I/ATLAS is only the third identified macroscopic object as being so alien. The comet's trajectory is shown in white on the featured map, where the orbits of Jupiter, Mars, and Earth are shown in gold, red, and blue. Currently Comet 3I/ATLAS is about the distance of Jupiter from the Sun -- but closing, with its closest approach to our Sun expected to be within the orbit of Mars in late October. Expected to pass near both Mars and Jupiter, 3I/ATLAS is not expected to pass close to the Earth. The origin of Comet 3I/ATLAS remains unknown. Although initial activity indicates a relatively normal comet, future observations about 3I/ATLAS' composition and nature will surely continue. Piece it All Together: Astronomy Puzzle of the Day

Diamond vault of the neo-Gothic Collegium Novum in Kraków, Poland.

Jar.ciurus, CC BY-SA 3.0 pl, via Wikimedia Commons. View source.

NASA Astronomy Picture of the Day:

Why is there a spiral around the North Pole of Mars? Each winter this pole develops a new outer layer about one meter thick composed of carbon dioxide frozen out of the thin Martian atmosphere. This fresh layer is deposited on a water-ice layer that exists year round. Strong winds blow down from above the cap's center and swirl due to the spin of the red planet -- contributing to Planum Boreum's spiral structure. The featured image is a perspective mosaic generated in 2017 from numerous images taken by ESA's Mars Express and elevations extracted from the laser altimeter aboard NASA's Mars Global Surveyor mission.

Tenzin Gyatso, the fourteenth and current Dalai Lama, is the highest spiritual leader and head of Tibetan Buddhism. In 1959, he escaped from Tibet to India following the Tibetan uprising against Chinese occupation of Tibet, and established the Tibetan government-in-exile, which continues to function in Dharamsala, India, where he resides. He was awarded the Nobel Peace Prize in 1989. Today is his 90th birthday.

Luca Galuzzi (Lucag), CC BY-SA 2.5, via Wikimedia Commons. View source.

NASA Astronomy Picture of the Day:

Difficult to capture, this mysterious, squid-shaped interstellar cloud spans nearly three full moons in planet Earth's sky. Discovered in 2011 by French astro-imager Nicolas Outters, the Squid Nebula's bipolar shape is distinguished here by the telltale blue emission from doubly ionized oxygen atoms. Though apparently surrounded by the reddish hydrogen emission region Sh2-129, the true distance and nature of the Squid Nebula have been difficult to determine. Still, one investigation suggests Ou4 really does lie within Sh2-129 some 2,300 light-years away. Consistent with that scenario, the cosmic squid would represent a spectacular outflow of material driven by a triple system of hot, massive stars, cataloged as HR8119, seen near the center of the nebula. If so, this truly giant squid nebula would physically be over 50 light-years across.

Photo by Massimo Di Fusco

Redstart (Phoenicurus phoenicurus) male ringed, Għadira Nature Reserve, Malta. Bird ringing is a vital activity that helps protect birds. In Malta, birds are humanely caught in mist nets which are checked every ten minutes. Each bird is ringed and weighed before being released. About 10% are retraps (i.e. they have been ringed before). The programme is carried on by BirdLife Malta.Ringing has shown that birds from at least 48 countries use Malta during migration. Unfortunately, Malta has the densest population of bird hunters in the European Union. The high numbers of wild birds illegally shot in Malta has led to the European Commission taking legal infringement proceedings against the Maltese Government over Article 5 of the Birds Directive.

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

              The New Colossus

Not like the brazen giant of Greek fame,
With conquering limbs astride from land to land;
Here at our sea-washed, sunset gates shall stand
A mighty woman with a torch, whose flame
Is the imprisoned lightning, and her name
Mother of Exiles. From her beacon-hand
Glows world-wide welcome; her mild eyes command
The air-bridged harbor that twin cities frame.
“Keep, ancient lands, your storied pomp!” cries she
With silent lips. “Give me your tired, your poor,
Your huddled masses yearning to breathe free,
The wretched refuse of your teeming shore.
Send these, the homeless, tempest-tost to me,
I lift my lamp beside the golden door!”

Emma Lazarus (1849 – 1887) was an American author of poetry, prose, and translations. Her sonnet "The New Colossus" was inspired by the Statue of Liberty, in 1883. Its lines appear inscribed on a bronze plaque on the pedestal of the Statue of Liberty installed in 1903. The last lines of the sonnet were set to music by Irving Berlin as the song "Give Me Your Tired, Your Your Poor. Lazarus was also the author of Poems and Translations (New York, 1867); Admetus, and other Poems (1871); Alide: An Episode of Goethe's Life (Philadelphia, 1874); Poems and Ballads of Heine and several others.

This poem, published in 1883,  is in the Public domain

NASA Astronomy Picture of the Day:

Face-on spiral galaxy NGC 6946 and open star cluster NGC 6939 share this cosmic snapshot, composed with over 68 hours of image data captured with a small telescope on planet Earth. The field of view spans spans about 1 degree or 2 full moons on the sky toward the northern constellation Cepheus. Seen through faint interstellar dust couds near the plane of our Milky Way galaxy, the stars of open cluster NGC 6939 are 5,600 light-years in the distance, near bottom right in the frame. Face-on spiral galaxy NGC 6946 is at top left, but lies some 22 million light-years away. In the last 100 years, 10 supernovae have been discovered in NGC 6946, the latest one seen in 2017. By comparison, the average rate of supernovae in our Milky Way is about 1 every 100 years or so. Of course, NGC 6946 is also known as The Fireworks Galaxy.

Photo by Alberto Pisabarro