Sun, Moon, the International Space Station and sunspots seen from Earth in one picture

While the Moon was busy passing between the Sun and Earth on January 4 for the first eclipse of 2011, the International Space Station (ISS) made its own pass between them. Powered by the Sun, orbiting the Earth, a satellite like the Moon—the ISS is an expression of how humanity is connected to and keeping an eye on all three bodies.

This photo was taken by astrophotographer Thierry Legault, who set up near Muscat, Oman, to capture this view at 1:09 p.m. local time (9:09 UTC) on January 4, 2011. He had to shoot quickly, as the transit of the space station through the field of view lasted just 0.86 seconds. The ISS was moving at 7.8 kilometers per second (17,000 mph).

The disk of the Sun is partly obscured on the lower left, as the Moon is 20 minutes past the maximum eclipse. The edges of the image are black because the light filters are strong, like a welder's mask, to prevent sunlight from damaging the camera.

The partial solar eclipse was the first of four in 2011, with others coming on June 1, July 1, and November 25. Eclipses occur when the new Moon passes in the line between Sun and Earth. Because the Moon’s orbit is inclined about 5 degrees to Earth’s, the Moon and its shadow often pass above or below the plane of the Earth. Because both orbits are elliptical, the size and shape of eclipses changes slightly with each event.

The image also includes sunspots 1140 (bottom) and 1142 (center), part of solar cycle 24, which should reach maximum in the next two years. Each spot was only producing relatively weak B-class solar flares on the day of the eclipse. Sunspots, flares, and great eruptions known as coronal mass ejections will become much more common in coming months, and each produces its own type of disturbance on Earth, including radio noise, auroras, and satellite and electric power disruptions. The solar cycle also plays a role in Earth's climate.

As for the space station, it is passing overhead regularly, as it makes 15 to 16 circuits around the Earth each day. It can pass through your local skies anywhere from one to three times per day, depending on your latitude and the path of the orbit. You don't have much time to spot it, though, as it crosses the sky in just a few minutes.

“Most people don’t know that, under the right conditions, you can use a telescope to actually see the shuttle and ISS this clearly,” writes astronomer Phil Plait, “and even then it ain’t easy.”

Image Credit & Copyright: Thierry Legault

Explanation of the image from: http://earthobservatory.nasa.gov/IOTD/view.php?id=48442

Wide View of 'Mystic Mountain'

This craggy fantasy mountaintop enshrouded by wispy clouds looks like a bizarre landscape from Tolkien's "The Lord of the Rings" or a Dr. Seuss book, depending on your imagination. The NASA Hubble Space Telescope photograph, which is stranger than fiction, captures the chaotic activity atop a three-light-year-tall pillar of gas and dust that is being eaten away by the brilliant light from nearby bright stars. The pillar is also being assaulted from within, as infant stars buried inside it fire off jets of gas that can be seen streaming from towering peaks.

This turbulent cosmic pinnacle lies within a tempestuous stellar nursery called the Carina Nebula, located 7,500 light-years away in the southern constellation Carina.

Scorching radiation and fast winds (streams of charged particles) from hot newborn stars in the nebula are shaping and compressing the pillar, causing new stars to form within it. Streamers of hot ionized gas can be seen flowing off the ridges of the structure, and wispy veils of dust, illuminated by starlight, float around its peaks. The pillar is resisting being eroded by radiation much like a towering butte in Utah's Monument Valley withstands erosion by water and wind.

Nestled inside this dense mountain are fledgling stars. Long streamers of gas can be seen shooting in opposite directions off the pedestal at the top of the image. Another pair of jets is visible at another peak near the center of the image. These jets are the signpost for new star birth. The jets are launched by swirling disks around the stars, as these disks allow material to slowly accrete onto the stars' surfaces.

Hubble's Wide Field Camera 3 observed the pillar on Feb. 1-2, 2010. The colors in this composite image correspond to the glow of oxygen (blue), hydrogen and nitrogen (green), and sulfur (red).

Image Credit: NASA, ESA, and M. Livio, STScI
Explanation from: http://hubblesite.org/newscenter/archive/releases/2010/13/image/e/

Milky Way Galaxy above the ESO 3.6-metre Telescope

What is in the Milky Way Galaxy?

• 300–500 billion stars (like the Sun, Sirius or Betelgeuse)

• at least 100 billion planets (like Mars, Jupiter or Kepler-14b)

• more than 10 billion planets in the Habitable Zone (like Earth, Gliese 667 Cc or Kepler-22b)

And the Milky Way Galaxy is one of at least 200-500 billion galaxies in the Observable Universe (like Andromeda Galaxy, Pinwheel Galaxy or Whirlpool Galaxy)

Image Credit: S. Brunier/ESO