Saturday, February 28, 2009
Wednesday, February 18, 2009
"A team demonstrates their concept for a robotic climber that could scale a 200-foot cable powered only by the beam from an industrial searchlight during the 2005 Beam Power Challenge. The challenge was part of NASA’s Centennial Challenges. Although none of the 11 teams won the challenge, the University of Saskatchewan Space Design Team had the farthest beam-powered climb, approximately 40 feet."
Tuesday, February 17, 2009
I'm not sure the exact source for the following photo. I believe that NASA has done these types of satellite images and National Geographic has done stories on this topic as well. The planet is under seige from an increasing amount of light pollution. It definitely makes observing the stars more difficult.
Tuesday, February 10, 2009
Sunday, February 8, 2009
SPACE.com Skywatching Columnist
posted: 06 February 2009
09:34 am ET
During the next few weeks, a comet bright enough for observation in binoculars and possibly even with the naked eye will provide a fine skywatching target when weather permits.
Comet Lulin will be closest to Earth on Feb. 24 and prime viewing will occur than and on surrounding nights. For sharp-eye viewers with dark, rural, skies, the comet is expected to be visible as a dim, fuzzy star.
People living in cities and suburbs are not expected to see the comet with the naked eye, but binoculars and telescopes will reveal its cloudy head and perhaps a striking tail, too. Comets are unpredictable, however, so it's impossible to say how bright this one might become.
Already Lulin is an enjoyable target for small telescopes, producing several striking photographs in the predawn sky. The object is best found using a sky map tailored to your location.
The comet was photographed by Chi Sheng Lin using a 16-inch telescope at the Lulin Observatory at Nantou, Taiwan on July 11, 2007. But it was a 19-year old student, Quanzhi Ye at Sun Yat-sen University in Mainland China who first recognized the new object on three images that were taken by Lin.
Initially it was thought to be an asteroid, new images taken a week later revealed the telltale presence of a faint coma.
The discovery was part of the Lulin Sky Survey project to explore the various populations of small bodies in the solar system, especially objects that possibly could pose a hazard to the Earth. As such, the comet has been christened Comet Lulin, more formally known to astronomers as Comet C/2007 N3.
This comet is the brightest since the surprising outburst of Comet Holmes more than 15 months ago and in the coming weeks will become favorably placed in the evening sky. During mid-to-late February it will probably be about magnitude 5 or 6, making it perhaps visible to the naked eye in dark, rural locations and easily observable in binoculars or small telescopes.
Brian Marsden of the Smithsonian Astrophysical Observatory has calculated that Comet Lulin passed through the perihelion point of its orbit (its closest approach to the sun) on Jan. 10, 113 million miles (182 million kilometers) from the sun. However, while the comet is now receding from the sun, its distance from the Earth is decreasing, with a minimum of 38 million miles (61 million kilometers) on Feb. 24.
For this reason, the comet should be at its brightest during the last week of February; then it will fade fast by mid-March.
The orbit of Comet Lulin is very nearly a parabola, according to Marsden. It is also rather unusual since it is moving through space in a direction opposite to that of the planets at a very low inclination of just 1.6-degrees from the ecliptic. As such, because it is moving opposite to the motion of our Earth, the comet will appear to track rather quickly against the background stars as one observes the object from one night to the next.
In addition, over the next three weeks, the comet will appear to rise an average of about 20-minutes earlier each night. Right now, it is best seen in the predawn sky.
On the night of Feb. 7, for instance, Lulin will rise above the east-southeast horizon around midnight and will appear at its highest in the sky toward the south at the break of dawn. But on the night of the 24th, when it will be passing nearest to Earth, Lulin will be visible all night, rising in the east at dusk, peaking high in the south shortly after midnight and setting in the west around sunrise.
Currently located in the constellation Libra, Comet Lulin will appear to move on a northwest trajectory, crossing over into Virgo on Feb. 11 and passing 3-degrees north of the 1st-magnitude star Spica in Virgo on Feb. 16 (for comparison, your clenched fist held at arm's length measures about 10-degrees in width).
On the night of Feb. 23, now virtually at its peak brightness, the comet will be sitting just 2-degrees south-southwest of the planet Saturn, which you can use as a benchmark to locate the comet. Moreover, around this time, Comet Lulin will be racing at more than 5-degrees per day -- that's roughly the equivalent of the distance between the stars Dubhe and Merak, the "Pointer Stars" of the Big Dipper; so even a few minutes of watching with a telescope should reveal the comet's slow shift relative to background field stars.
On Feb. 27, the fading comet will slip just 1-degree south of the 1st-magnitude star, Regulus in Leo. And come the night of March 5, Lulin -- by then probably between magnitudes 6 and 7 and no longer visible without binoculars or a telescope -- will pass to within 2-degrees of the famous Beehive Star Cluster in Cancer.
Look for an Antitail
Comets are visible because radiation from the sun releases gas and dust from the comet. That material then shines with reflected sunlight, creating a cloudy head, or coma, and sometimes one or two tails.
Even when it's at its very brightest, naked-eye observers probably see Comet Lulin as resembling only a dim, fuzzy star. In binoculars, or a small telescope the comet may resemble an apple on a stick; that is, the comet's diffuse head or coma should appear round and somewhat condensed toward its center, with perhaps a tinge of blue or green, while a narrow tail of gas extends out to the northwest.
In addition, telescopic observers should also look for a "spike" of light, pointing in a direction opposite to the tail. This strange effect, called an "antitail," is caused by a thin sheet of dust that is expelled by the comet but normally is visible for a brief interval when the Earth passes through the comet's orbital plane.
But because Earth will remain in the comet's orbital plane through February and on into March, there will be an ongoing chance of catching a glimpse of the antitail as well.
posted: 08 February 2009
10:45 am ET
A modest eclipse of the moon will occur early Monday morning, Feb 9. The outer portion of Earth's shadow will cover part of the moon, causing a slight darkening of the moon.
Sky watchers will not see a dramatic "bite" taken out of the moon as occurs with a partial eclipse. Nor will the moon get very dark, as in a total eclipse. In fact most people will not even notice this eclipse unless they're aware of its timing and watch the event unfold.
The eclipse will be visible just before dawn from western North America, as well as earlier in the morning in Hawaii and Australia. The moon will be near the western horizon, about to set. Only those with dark skies during the timing of the event will have a chance to see much, weather permitting.
The moon shines because it reflects sunlight. Lunar eclipses occur only at the time of full moon, and only when the sun, Earth and moon are all in a line, causing Earth to block sunlight and throw a shadow on the moon. A total eclipse occurs when this alignment is perfect, so that the Earth's full main shadow, called the umbra, makes the moon go dark.
But because the moon orbits Earth in a slightly different plane compared to our planet's orbit around the sun, the setup is rarely perfect. Most full moons come and go without generating an eclipse.
Earth's outer shadow, called the penumbra, is not as dark. Monday's event is called a penumbral eclipse, because only this outer, partial shadow will fall on the moon.
The moon begins to slide into the penumbra at 4:36 a.m. PST as viewed from along the coast of California, according to the U.S. Naval Observatory's eclipse calculator. The middle of the eclipse comes at about 6:38 a.m. PST. The moon sets before the eclipse is done.
In Alaska, the eclipse begins at 3:36 a.m. local time. In Hawaii, it's 2:36 a.m. local time. East Asia will have good viewing opportunities even earlier.
In Phoenix, Arizona, only the beginning of the event will be visible, starting at 5:36 a.m. local time. The farther east you are, the less the eclipse will be visible. In fact for most of the country the even won't be seen.
Friday, February 6, 2009
Wednesday, February 4, 2009
The Canadian Astronaut Program was born when the NRC whittled down the list to six bona fide astronauts-in-training. They were Roberta Bondar, Marc Garneau, Steve MacLean, Ken Money, Robert Thirsk and Bjarni Tryggvason.
As of July 2005, 10 Canadians have trained to be astronauts. Eight have tested their skills in space, but two – Ken Money and Mike McKay – haven't flown a space mission.
Astronauts (first row, left to right) Roberta Bondar, Chris Hadfield, Robert Thirsk, Bjarni Tryggvason, and (second row, left to right) Marc Garneau, Steve Maclean, Julie Payette and Dave Williams pose for a photo at the John H. Chapman Space Centre in St. Hubert, Que., on Friday, Sept. 26, 2003. All eight Canadians who have spent time in space attended a ceremony where Canada Post unveiled an eight-stamp set. (Andre Pichette/Canadian Press)
Tuesday, February 3, 2009
The Associated Press
CAPE CANAVERAL, Fla. - NASA on Tuesday delayed next week's launch of space shuttle Discovery while it runs tests to determine whether newly installed valves would cause damage if they broke during liftoff.
The launch will take place no sooner than Feb. 19, seven days after the shuttle was originally scheduled to take off on a space station construction mission. The delay is needed to make certain that Discovery can fly safely with the valves that control the flow of gaseous hydrogen into the external fuel tank, said NASA's space operations chief, Bill Gerstenmaier.
"We want to make sure we've got this right. This has important consequences to us," Gerstenmaier said. "So we think standing down for a little bit of time and letting the folks do a little more work is a good thing."
Three new gas pressure valves were installed in Discovery's engine compartment after a small part of one broke off during shuttle Endeavour's launch in November. Endeavour's fuel tank maintained good pressure and, in the end, no harm was done.
Engineers believe fatigue caused by acoustic vibrations caused the valve in Endeavour to break. Over the next week, experts will use lab tests to try to ascertain whether a broken chunk of valve could damage any of the downstream plumbing.
Top NASA managers decided on the delay Tuesday night after an entire day of closed-door meetings at the Kennedy Space Center to discuss launch preparations.
Discovery and its seven-man crew are set to deliver the last set of solar wings to the International Space Station.
Sunday, February 1, 2009
Here is a link to the Google Lunar X site -
Google Lunar X
Click the link below to be taken to the NASA ISS site where you can get viewing data -
International Space Station fly-overs