APOD: 2023 December 18 Б The Same Color Illusion
17.12.2023

Are squares A and B the same color? They are! To verify this, either run your cursor over the image or click here to see them connected. The featured illusion, an example...

APOD: 2025 July 12 Б Clouds and the Golden Moon
11.07.2025

As the Sun set, a bright Full Moon rose on July 10. Its golden light illuminates clouds drifting through southern hemisphere skies in this well-composed telephoto image from Conceiццёo do Coitц, Bahia, Brazil. The brightest lunar phase is captured here with both a short and long exposure.

APOD: 2025 August 15 Б Moonlight, Planets, and Perseids
14.08.2025

In the predawn sky on August 13, two planets were close. And despite the glare of a waning gibbous Moon, bright Jupiter and even brighter Venus were hard to miss. Their brilliant close conjunction is poised above the eastern horizon in this early morning skyscape.

APOD: 2024 July 29 Б Milky Way over Uluru
28.07.2024

What's happening above Uluru? A United Nations World Heritage Site, Uluru is an extraordinary 350-meter high mountain in central Australia that rises sharply from nearly flat surroundings. Composed of sandstone, Uluru has slowly formed over the past 300 million years as softer rock eroded away.

APOD: 2026 April 25 Б The Persistence of Sunlight
24.04.2026

This seaside sunset offered a surreal experience, captured in a sea and skyscape from the west coast of Sardinia, Italy, planet Earth. The Daliesque scene is a composition of sequential exposures made with a camera and long telephoto lens. The Sun is not melting, though.

APOD: 2023 February 12 Б Mammatus Clouds over Nebraska
11.02.2023

When do cloud bottoms appear like bubbles? Normally, cloud bottoms are flat. This is because moist warm air that rises and cools will condense into water droplets at a specific temperature, which usually corresponds to a very specific height. As water droplets grow, an opaque cloud forms.

APOD: 2026 September 16 Б Webb's View of M64
15.09.2026

Sometimes where Hubble finds darkness, Webb sees light. An example is todayБs composite images of Messier 64 (M64), a nearby spiral galaxy of many names. The dark band of dust partially blocking its bright core earned it the moniker Бthe Black Eye Galaxy.

APOD: 2023 May 28 Б Ida and Dactyl: Asteroid and Moon
27.05.2023

This asteroid has a moon. The robot spacecraft Galileo on route to Jupiter in 1993 encountered and photographed two asteroids during its long interplanetary voyage. The second minor planet it photographed, 243 Ida, was unexpectedly discovered to have a moon.

APOD: 2025 July 23 Б Fireball over Cape San Blas
22.07.2025

Have you ever seen a fireball? In astronomy, a fireball is a very bright meteor -- one at least as bright as Venus and possibly brighter than even a full Moon. Fireballs are rare -- if you see one you are likely to remember it for your whole life.

APOD: 2024 March 27 Б The Coma Cluster of Galaxies
26.03.2024

Almost every object in the featured photograph is a galaxy. The Coma Cluster of Galaxies pictured here is one of the densest clusters known - it contains thousands of galaxies. Each of these galaxies houses billions of stars - just as our own Milky Way Galaxy does.