Moons and More
{thumb} Moon North Pole -- 2002.11.16
A view of the Moon not visible from Earth, looking right down on the top of it.[=] Credits: Workspace image from a theme called North Pole of Moon by WombleIncarnate, originally from a NASA site.
{thumb} Moon Star Craters -- 2002.11.23
A digital close-up of the full Moon featuring two prominent ray craters, Copernicus (upper left) and Tycho (lower right), each with extensive ray systems of light-colored debris blasted out by the crater-forming impacts. 85 km wide, Tycho, with its far reaching rays, is the youngest large crater on the Moon's nearside. Copernicus, surrounded by dark mare that contrast nicely with its bright rays, is 93 km in diameter.[=] Credits: APOD archive, 2001.08.09. Copyright: Steve Mandel, Hidden Valley Observatory.
{thumb} Moon Eclipsed -- 2003.11.29
November, 2003. The eclipsed Moon reflected reddened light filtering on to its surface from sunsets and sunrises around the edges of a silhouetted Earth. The ray crater Tycho, about 85 km across, stands out near the Moon's brighter southern edge.[=] Credits: APOD archive, 2003.11.21, Markus Strassfeld.
{thumb} Moon Eclipsed IR -- 2003.11.09
The total lunar eclipse of Sept. 1996 in infrared light. The bright spots correspond to warm areas on the lunar surface, dark areas are cooler. The brightest spot below and left of center is the crater Tycho, the dark region at the upper right is the Mare Crisium.[=] Credits: APOD archive, 2003.11.08, DCATT Team, MSX Project, BMDO.
{thumb} Color Moon -- 2006.02.20
Calibrated by rock samples from the Apollo missions, the different colors correspond to differences in the chemical makeup of the lunar surface.[=] Credits: APOD archive, 2006.02.16. Photo and copyright Johannes Schedler (Panther Observatory).
{thumb} Jupiter and Io 2 -- 2002.11.13
Orbiting Jupiter every 43 hours, the volcanic moon Io cruises 500,000 kilometers above banded cloud-tops. Orbiting Earth every 1.5 hours, Hubble caught Io and its shadow crossing the giant planet in 1997. Reflective patches of sulfur dioxide "frost" are visible on Io's surface.[=] Credits: APOD archive, 1999.04.23. John Spencer (Lowell Observatory), NASA.
{thumb} Europa Ice -- 2002.11.13
Europa, one of Jupiter's large moons, may well have an ocean of liquid water beneath its icy surface, holding the tantalizing possibility of life. Surface ridges and cracks appear along with domes and dark reddish lenticulae about 10 km across, believed to be blobs of warmer ice from below that have gradually risen through the colder surface layers, analogous to the motions in a lava lamp.[=] Credits: APOD archive, 2002.11.01. R. Pappalardo (U. Colorado) et al., Galileo Project, JPL, NASA.
{thumb} Titan Halo -- 2006.01.18
With its thick, distended atmosphere, Titan's orange globe shines softly, encircled by a thin halo of purple light-scattering haze.[=] Credits: NASA POD, 2006.01.17. NASA/ JPL/ Space Science Institute.
{thumb} Titan Huygens -- 2003.09.22
How Saturn might look from Titan, its largest moon. In the foreground sits ESA's Huygens probe, which was released by NASA's Cassini spacecraft and landed on Titan's surface in 2005.[=] Credits: APOD archive, 2001.10.13. Illustration Credit: ESA, NASA.
{thumb} Titan Art -- 2005.03.14
The Planetary Society's Huygens Art Contest drew 435 entries from 35 countries. Contestants submitted their visions of what the Saturnian moon Titan might look like. Among the first-prize winners in the adult category was this "Titan Sunset".[=] Credits: Copyright Steve Munsinger. Courtesy of The Planetary Society. Of his work artist Munsinger says, "Since we can't as yet go to these places the next best thing is to explore with the mind and imagination."
{thumb} Rhea -- 2003.09.26
Rhea is Saturn's second-largest moon. It is mostly water ice, but has a small rocky core.[=] Credits: APOD archive, 2002.06.08. Credit: Voyager, NASA; Copyright: Calvin J. Hamilton.
{thumb} Phoebe -- 2006.02.15
Images of Saturn's moon Phoebe, seen from robotic Cassini spacecraft indicate that Phoebe may have originated in the outer Solar System. Phoebe is about 200 km in diameter.[=] Credits: APOD archive, 2006.02.12. Cassini Imaging Team, SSI, JPL, ESA, NASA.
{thumb} Telesto -- 2006.02.24
It remains a mystery why Saturn's 24 km moon Telesto is so smooth compared to most other Saturnian moons. One possibility is that it's covered by granular icy material.[=] Credits: APOD archive, 2006.02.22. Cassini Imaging Team, SSI, JPL, ESA, NASA.
{thumb} Tethys Basin -- 2006.02.08
Saturn's moon Tethys, about 1000 km in diameter, survived a major collision that created the Odysseus impact crater, sometimes called the Great Basin.[=] Credits: APOD archive, 2006.02.08. Cassini Imaging Team, SSI, JPL, ESA, NASA.
{thumb} Tethys Closeup -- 2005.12.22
The surface of Saturn's moon Tethys is riddled with icy cliffs and craters. This image of Tethys was captured by Cassini from a distance of about 32,000 km. The density of Tethys indicates a composition almost entirely of water ice. The moon's diameter is about 1000 km.[=] Credits: APOD archive, 2005.10.12. Cassini Imaging Team, SSI, JPL, ESA, NASA.
{thumb} Tethys Ring Shadow -- 2005.12.23
Caught in sunlight just below and left of center, Tethys is about 1,000 km in diameter. Orbiting at around 300,000 km from Saturn's center, it is well outside Saturn's main bright rings, whose shadows fall on the giant planet's surface.[=] Credits: APOD archive, 2005.07.22. Cassini Imaging Team, SSI, JPL, ESA, NASA.
{thumb} Dione Ringside -- 2005.12.22
Orbiting in the plane of Saturn's rings, icy Dione has a perpetual ringside view of the gas giant planet. The rings themselves slice across the bottom of the image.[=] Credits: APOD archive, 2005.10.21. Cassini Imaging Team, SSI, JPL, ESA, NASA.
{thumb} Quaoar -- 2002.11.16
An artist's impression of Quaoar (pronounced kwa-whar). About half the size of Pluto, Quaoar orbits the Sun about 4 billion miles away, more than a billion miles farther than Pluto. Like Pluto, Quaoar dwells in the Kuiper belt, comet-like bodies extending 7 billion miles beyond Neptune's orbit.[=] Credits: Hubble, STScI-PRC02-17a, 2002.10.07. NASA, G. Bacon (STScI), M. Brown (Caltech).
{thumb} Sedna -- 2005.12.25
A dark red object called Sedna is the most distant known object in our solar system. This illustration shows how Sedna might look facing the distant Sun.[=] Credits: APOD archive, 2004.03.16. Illustration credit: R. Hurt (SSC-Caltech), JPL-Caltech, NASA.
{thumb} Andromeda and Ikeya-Zhang -- 2002.11.12
The comet Ikeya-Zhang, visible in spring of 2002 and then about 80 million km from Earth, appears to be headed toward the Andromeda galaxy, but it's an illusion: Andromeda is about 2 million light years away. The smudge visible beneath Andromeda is M110, a companion galaxy.[=] Credits: APOD archive, 2002.04.12. Photo by Juan Carlos Casado, near Figueres, Spain.
{thumb} Pleiades and Machholz -- 2006.01.02
Sweeping northward in planet Earth's sky, comet Machholz extended its long ion tail with the Pleiades star cluster in the background. This view, recorded with a telephoto lens in skies over Oberjoch, Bavaria, Germany, emphasizes faint, complex tail structures and the scene's blue and green colors.[=] Credits: APOD archive, 2005.01.11. Copyright: Stefan Seip.
{thumb} Comet Pojmanski -- 2006.03.07
A new comet brightened unexpectedly and was briefly visible as a faint streak to the unaided northern observer in the eastern morning sky just before sunrise.[=] Credits: APOD archive, 2006.03.06. Photo and copyright Chris Schur, 2006.
{thumb} Asteroid Gaspra -- 2002.11.13
Asteroid 951 Gaspra is a huge rock tumbling in space. In this 1991 Galileo photograph, subtle color variations have been exaggerated to highlight changes in reflectivity, surface structure and composition. Gaspra is about 20 kilometers long and orbits the Sun in the main asteroid belt between Mars and Jupiter.[=] Credits: APOD archive, 2002.10.27. The Galileo Project, NASA.
{thumb} Asteroid Kleopatra -- 2002.11.23
Eight views of an asteroid the size of New Jersey, orbiting the Sun between Mars and Jupiter, shaped like a dog-bone. Asteroid 216 Kleopatra, recently mapped with Earth-based radar, reflects radio waves so well that astronomers speculate it is composed mostly of metals like nickel and iron. Kleopatra will never strike the Earth, but it may one day serve as a valuable source of raw building materials.[=] Credits: APOD archive, 2000.05.10. Stephen Ostro et al. (JPL), Arecibo Radio Telescope, NSF, NASA.
{thumb} Ida Dactyl -- 2003.09.17
During its long journey to Jupiter, the Galileo spacecraft photographed asteroid Ida. The asteroid has a moon, named Dactyl, appearing to the right of Ida here. Dactyl is about one mile across, while Ida measures about 36 miles long and 14 miles wide.[=] Credits: APOD archive, 2002.06.30. Galileo Project, JPL, NASA.
{thumb} Leonids -- 2002.12.15
As seen in a series of twelve exposures taken the morning of Nov. 19 from Florida, Leonid meteors streak into Earth's atmosphere against a background of stars in the direction of Ursa Major.[=] Credits: APOD archive, 2002.12.11. Copyright Pierre Martin & Michael F. Vasseur (OAOG).