Gemini Observatory North
* Image Credit & Copyright: Joy Pollard (Gemini Observatory)

Explanation:
It does look like a flying saucer, but this technologically advanced structure is not here to deliver the wise extraterrestrial from the scifi classic movie The Day the Earth Stood Still. It is here to advance our knowledge of the Universe though. Shown sitting near the top of a mountain in Hawaii, the dome of the Gemini Observatory North houses one of two identical 8.1-meter diameter telescopes. Used with its southern hemisphere twin observatory in Chile, the two can access the entire sky from planet Earth. Constructed from 85 exposures lasting 30 seconds each with camera fixed to a tripod, the image also clearly demonstrates that the Earth did not stand still. Adjusted to be brighter at the ends of their arcs, the concentric star trails centered on the North Celestial Pole are a reflection of Earth's rotation around its axis. Close to the horizon at Hawaiian latitudes, Polaris, the North Star, makes the shortest star trail. The fainter denser forest of star trails toward the right is part of the rising Milky Way.

https://apod.nasa.gov/apod/ap161015.html

#space #earth #astrophotography #photography #astroart #art #science #nature

Panoramic Eclipse Composite with Star Trails
Image Credit & Copyright: Stephane Vetter (Nuits sacrees, TWAN)

Explanation:
What was happening in the sky during last week's total solar eclipse? This featured little-planet, all-sky, double time-lapse, digitally-fused composite captured celestial action during both night and day from a single location. In this 360x180 panorama, north and south are at the image bottom and top, while east and west are at the left and right edges, respectively. During four hours the night before the eclipse, star trails were captured circling the north celestial pole (bottom) as the Earth spun. During the day of the total eclipse, the Sun was captured every fifteen minutes from sunrise to sunset (top), sometimes in partial eclipse. All of these images were then digitally merged onto a single image taken exactly during the total solar eclipse. Then, the Sun's bright corona could be seen flaring around the dark new Moon (upper left), while Venus simultaneously became easily visible (top). The tree in the middle, below the camera, is a Douglas fir. The images were taken with care and planning at Magone Lake in Oregon, USA.

https://apod.nasa.gov/apod/ap170830.html

#space #earth #astrophotography #photography #astroart #art #science #nature

Star Trails and the Bracewell Radio Sundial
* Image Credit & Copyright: Miles Lucas at NRAO

Explanation:
Sundials use the location of a shadow to measure the Earth's rotation and indicate the time of day. So it's fitting that this sundial, at the Very Large Array Radio Telescope Observatory in New Mexico, commemorates the history of radio astronomy and radio astronomy pioneer Ronald Bracewell. The radio sundial was constructed using pieces of a solar mapping radio telescope array that Bracewell orginaly built near the Stanford University campus. Bracewell's array was used to contribute data to plan the first Moon landing, its pillars signed by visiting scientists and radio astronomers, including two Nobel prize winners. As for most sundials the shadow cast by the central gnomon follows markers that show the solar time of day, along with solstices and equinoxes. But markers on the radio sundial are also laid out according to local sidereal time. They show the position of the invisible radio shadows of three bright radio sources in Earth's sky, supernova remnant Cassiopeia A, active galaxy Cygnus A, and active galaxy Centaurus A. Sidereal time is just star time, the Earth's rotation as measured with the stars and distant galaxies. That rotation is reflected in this composited hour-long exposure. Above the Bracewell Radio Sundial, the stars trace concentric trails around the north celestial pole.

https://apod.nasa.gov/apod/ap180713.html

#space #earth #astrophotography #photography #astroart #art #science #nature

A moving story behind a beautiful snapshot of #Comet C/2024 G3 ATLAS:

“We took the photograph while we were en route from northern #Chile to Santiago, travelling to attend the first workshop on Equity, Diversity, and Inclusion for the Chilean astronomical community at ESO-Vitacura. Little did we know that this journey would present us with a once-in-a-lifetime observational opportunity!

The flight was delayed, and as the plane ascended, the timing coincided perfectly with sunset. By pure coincidence, the window seat in our row was unoccupied, providing us an unobstructed view of the breathtaking landscape below. It was then that we noticed a faint but unmistakable glow in the sky: Comet C/2024 G3 Atlas!

Eager to share this spectacle, we informed the flight attendants, who promptly passed on the news to the pilots. They were as enthusiastic as us, and they made an announcement to the passengers, describing the rare sight visible outside the plane. The pilots dimmed the cabin lights and even turned off the wing lights to enhance visibility, allowing everyone onboard to experience the comet in its full glory.

The cabin was filled with awe as passengers took pictures of the comet. This moment was a testament to how celestial events can bring people together, even at 30,000 feet!”

🥲

Thanks for sharing this wonderful image and story, Virginia Cuomo from the Astronomy Department of La Serena University in Chile and the Chilean Astronomical Society, and Annagrazia Puglisi from the School of Physics and Astronomy of the University of Southampton!

📷 Annagrazia Puglisi

#astrodon #astronomy #astrophotography #space #science