Science Services’ Science Program Series Booklet Man In Space. Nelson Doubleday - 1965.

Hubble Ultra Deep Field

Astronomy Picture of the Day

2025 January 28

Comet G3 ATLAS over Uruguay

A foreground grass field is shown below a distant field of stars. On the grass field are some trees. Dwarfing the trees, in the sky, is a comet with a long tail.

Image Credit & Copyright: Mauricio Salazar

Explanation: Comets can be huge. When far from the Sun, a comet's size usually refers to its hard nucleus of ice and rock, which typically spans a few kilometers -- smaller than even a small moon. When nearing the Sun, however, this nucleus can eject dust and gas and leave a thin tail that can spread to an enormous length -- even greater than the distance between the Earth and the Sun. Pictured, C/2024 G3 (ATLAS) sports a tail of sunlight-reflecting dust and glowing gas that spans several times the apparent size of a full moon, appearing even larger on long duration camera images than to the unaided eye. The featured image shows impressive Comet ATLAS over trees and a grass field in Sierras de Mahoma, San Jose, Uruguay about a week ago. After being prominent in the sunset skies of Earth's southern hemisphere, Comet G3 ATLAS is now fading as it moves away from the Sun, making its impressive tails increasingly hard to see.

Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)

NASA Official: Amber Straughn

A service of: ASD at NASA / GSFC,

NASA Science Activation

& Michigan Tech. U.

Oyster Nebula (NGC 1501)

(NEW) click on ALT for brief description.

openin’ the door to the microwave one second early because you don’t need all the hootin’ and hollerin’

Some sketches from my trip last week

Contact (1997)

Rectangular log map scheme of the observable universe

Stepping out on the front porch. Astronaut David Scott opens the hatch to check out the view during Apollo 9, March 1969. In this pic taken by fellow astronaut Rusty Schweickart, ‘Gumdrop’, the Command Service Module is docked with ‘Spider’, the Lunar Module. A9 was the 1st flight incorporating all Apollo spacecraft components. The 10 day mission was the 2nd launched by a Saturn V rocket.