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NASA Astronomy Picture of the Day:

The bright clusters and nebulae of planet Earth's night sky are often given the names of flowers or insects, and its whopping 3 light-year wingspan, NGC 6302 is no exception. With an estimated surface temperature of about 250,000 degrees C, the central star of the planetary nebula is transforming into a white dwarf star, becoming exceptionally hot, and shining brightly in ultraviolet light. The central star is hidden from direct view by a torus of dust, but its energetic ultraviolet light ionizes atoms in the nebula. In this sharp, telescopic view composed with narrowband image data, the ionized hydrogen and doubly ionized oxygen atoms are shown in their characteristic red and blue-green hues to reveal a stunning complex of knots and filaments within the nebula's wing-like bipolar outflows. NGC 6302 lies about 4,000 light-years away in the arachnologically correct constellation of the Scorpion (Scorpius).

Photo by Mike Selby

National Museum in Wrocław, Poland.

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

NASA Astronomy Picture of the Day:

Savudrija lighthouse shines along the coast near the northern end of the Istrian peninsula in this well-composed night skyscape. A navigational aid for sailors on the Adriatic Sea, the historic lighthouse was constructed in the early 19th century. But an even older aid to navigation shines in the sky above, Polaris, alpha star of the constellation Ursa Minor and also known as the North Star. In this scene Polaris forms the shortest bright arc near the North Celestial Pole, the extension of Earth's axis of rotation into space. Of course, the North Celestial Pole lies exactly at the center of all the concentric startrails. The composite image is a digital stack of 400 exposures, each 30 seconds long, taken with camera and tripod fixed to a rotating planet.

Photo by Branko Nadj

Ceiling of the Oratory of Saint Mary Queen and Mother, Málaga, Spain. The church was constructed in 2008 and is host of the Confraternity of the Sorrows. The paintings in the ceiling, done with acrylic paint, are work of Raúl Berzosa Fernández and were executed in different phases between 2008 and 2014. The 140 square metres (1,500 sq ft) surface is dedicated to the Coronation of the Virgin.

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

“There are three ways of arriving at an opinion on any subject. The first is to believe what one is told; the second is to disbelieve it; and the third is to examine the matter for oneself. The overwhelming majority of mankind practice the first method; of the remainder, the overwhelming majority practice the second; only an infinitesimal remnant practice the third.”

Source:  Bertrand Russell, Mortals and Others, Bertrand Russell’s American Essays 1931–1935, Vol. II, Essay. 37: What to Believe, p. 454 (24 August 1931)

NASA Astronomy Picture of the Day:

Is the sky the same every night? No -- the night sky changes every night in many ways. To better explore how the night sky changes, the USA's NSF and DOE commissioned the Vera C. Rubin Observatory in Cerro Pachón, Chile. In final testing before routine operations, Rubin will begin to explore these nightly changes -- slight differences that can tell us much about our amazing universe and its surprising zoo of objects. With a mirror over 8 meters across, Rubin will continually reimage the entire visible sky every few nights to discover new supernovas, potentially dangerous asteroids, faint comets, and variable stars -- as well as mapping out the visible universe's large-scale structure. Pictured, the distant central band of our Milky Way Galaxy appears to flow out from the newly operational observatory. Taken last month, the featured picture is a composite of 21 images across the night sky, capturing airglow on the horizon and the Small Magellanic Cloud galaxy on the lower left. APOD Turns 30!: Free Public Lecture in Anchorage on June 11

Clouds over the Greater Caucasus Range, along with fog and atmospheric mist. The landscape represents geological features from different geological epochs: Triassic, Jurassic, and the Oligocene. View from Mount Asbestnaya, Republic of Adygea, Caucasus Mountains.

Vyacheslav Argenberg, CC BY 4.0, via Wikimedia Commons. View source.

NASA Astronomy Picture of the Day:

Why would the sky glow like a giant repeating rainbow? Airglow. Now, air glows all of the time, but it is usually hard to see. A disturbance however -- like an approaching storm -- may cause noticeable rippling in the Earth's atmosphere. These gravity waves are oscillations in air analogous to those created when a rock is thrown in calm water. The long-duration exposure nearly along the vertical walls of airglow likely made the undulating structure particularly visible. OK, but where do the colors originate? The deep red glow likely originates from OH molecules about 87 kilometers high, excited by ultraviolet light from the Sun. The orange and green airglow is likely caused by sodium and oxygen atoms slightly higher up. The featured image was captured during a climb up Mount Pico in the Azores of Portugal. Ground lights originate from the island of Faial in the Atlantic Ocean. A spectacular sky is visible through this banded airglow, with the central band of our Milky Way Galaxy running up the image center, and M31, the Andromeda Galaxy, visible near the top left. APOD Turns 30!: Free Public Lecture in Anchorage on June 11

Photo by Miguel Claro (TWAN); Rollover Annotation: Judy Schmidt