Mare Cognitum ("The Sea That Has Become Known") With Kuiper Crater At The Center // L'AstroVan

We sure have been experiencing this around here. Not only has it affected temperatures, but the percentage of time the sky is cloudy. Our observatory takes images and hosts events less often in part because of the conditions of our sky.

So many people do not understand the relationship between climate change and cold weather.

Comet Nishimura Credit: Peter Kennett

The brown dwarf W1935 is a bit of a mystery. Astronomers using the James Webb Space Telescope picked up glowing methane—a sign that the object’s upper atmosphere is being heated. But the brown dwarf has no host star, so where could the heat be coming from?

In our solar system, Jupiter and Saturn show methane emission due to the presence of auroras—what we call the Northern Lights on Earth. W1935 might also have auroras, which could be powered by energetic particles from a nearby, active moon, like Jupiter’s Io: https://webbtelescope.pub/4aKMkBF

M104: The Sombrero Galaxy

Credits: Bray Falls

Make your Halloween pumpkin shine bright like a star observed by the James Webb Space Telescope! 🎃

The 8-point diffraction spikes are a signature look in Webb’s images of bright objects in the universe. Download the stencil or any of the other Webb patterns: https://webbtelescope.pub/46HNvPV

Astronomy Word of the Day

The Magellanic Clouds are two small, irregular dwarf galaxies outside of the Milky Way. These two galaxies are visible in the skies of the southern hemisphere, close to the South Celestial Pole, so they don't appear to set!

Image: https://aaa.org/.../01/southern-skies-the-magellanic-clouds/

2023 October 23

Moon Io from Spacecraft Juno Image Credit: NASA, JPL-Caltech, SwRI, MSSS; Processing & Copyright: Ted Stryk & Fernando García Navarro

Explanation: There goes another one! Volcanoes on Jupiter’s moon Io keep erupting. To investigate, NASA’s robotic Juno spacecraft has begun a series of visits to this very strange moon. Io is about the size of Earth’s moon, but because of gravitational flexing by Jupiter and other moons, Io’s interior gets heated and its surface has become covered with volcanoes. The featured image is from last week’s flyby, passing within 12,000 kilometers above the dangerously active world. The surface of Io is covered with sulfur and frozen sulfur dioxide, making it appear yellow, orange and brown. As hoped, Juno flew by just as a volcano was erupting – with its faint plume visible near the top of the featured image. Studying Io’s volcanoes and plumes helps humanity better understand how Jupiter’s complex system of moons, rings, and auroras interact. Juno is scheduled to make two flybys of Io during the coming months that are almost 10 times closer: one in December and another in February 2024.

∞ Source: apod.nasa.gov/apod/ap231023.html

Video of the Day!

An artist’s rendering shows us what happens when a star gets a little too close to a massive black hole!

2024 August 10

The Light, Dark, and Dusty Trifid Image Credit & Copyright: Robert Edelmaier and Gabriele Gegenbauer

Explanation: Messier 20, popularly known as the Trifid Nebula, lies about 5,000 light-years away toward the nebula rich constellation Sagittarius. A star forming region in the plane of our galaxy, the Trifid does illustrate three different types of astronomical nebulae; red emission nebulae dominated by light from hydrogen atoms, blue reflection nebulae produced by dust reflecting starlight, and dark nebulae where dense dust clouds appear in silhouette. The reddish emission region, roughly separated into three parts by obscuring dust lanes, is what lends the Trifid its popular name. The cosmic cloud complex is over 40 light-years across and would cover the area of a full moon on planet Earth’s sky. But the Trifid Nebula is too faint to be seen by the unaided eye. Over 75 hours of image data captured under dark night skies was used to create this stunning telescopic view.

∞ Source: apod.nasa.gov/apod/ap240810.html

The 2023 Annular Eclipse as seen from Albuquerque, NM // Jordan Martin