Stars Missing In Action Now Counted

Almost one in five exploding stars in nearby galaxies is simply not seen, astronomers have determined.

For galaxies further out, that fraction doubles. This finding clears the way for these stellar beacons to be used as a good measure of how fast galaxies made stars earlier in the universe's history.

Key evidence for this "body count" of missing supernovae has come from detailed studies of the galaxy Arp 299, made with the 8.2-m Gemini North telescope.

The work is reported in a paper, "Core-Collapse Supernovae Missed by Optical Surveys", published online in the Astrophysical Journal last month.

Massive stars live fast and die young, going out in a blaze of glory as "core-collapse supernovae".

"Because they don't live long, only about 10 million years, the number of massive stars that we can see being born should be essentially identical to the number we see exploding," said the study's lead author, Dr. Seppo Mattila of the University of Turku in Finland.

"The trouble has been, lots of these supernovae just seemed to have gone missing," he said.

"We expected to see more."

Our own Milky Way Galaxy is a case in point.

Two to three supernovae should explode in our galaxy every century. But the last time anyone might - just might - have seen one directly was in 1680.

In 2008, however, NASA's Chandra X-ray Observatory and the Very Large Array radio telescope of the US National Radio Astronomy Observatory found a supernova remnant about 140 years old near the center of our galaxy.

"That's where the supernovae are mostly hiding - in the dusty central parts of galaxies," said Dr. Stuart Ryder of the Australian Astronomical Observatory, one of the new paper's authors.

"That's where most stars in a galaxy congregate, and where most of them die."

Amateur Astronomer Discovers Blue-Raspberry-Shaped Planetary Nebula

Combing through the night sky and looking for possible planetary nebulae is tough, tedious work.

NASA actually works with several amateur astronomy groups to examine the findings from its Kepler space observatory, so sometimes, the big discoveries are made by amateurs--including this one, the newest known planetary nebula, named Kronberger 61.

This image, provided by the Gemini Observatory, shows the "ionised shell of expelled gas," colored blue due to the double-ionisation of the oxygen.

If you look closely, you can see the star at the center of the system--it's the bright bluish dot near the centre of the blue-raspberry-like shell.

The Kepler mission's goal is to find Earth-like planets, so the discovery of a new planetary nebula opens up the possibility for some exciting new discoveries.

It'll take a lot more examination to find out if there are any "Goldlocks planets," close enough but not too close to a star to foster the kind of life we have on Earth, but the discovery certainly opens the door for that kind of study.

The star was discovered by, and named for, an amateur Austrian astronomer named Matthias Kronberger, who works with a group of other amateurs known as Deep Sky Hunters.

Planetary Nebula Discovered By Amateur Astronomer

Gemini Observatory image of Kronberger 61 showing the ionized shell of expelled gas resembling a soccer ball.

The light of the nebula here is primarily due to emission from twice-ionized oxygen, and its central star can be seen as the slightly bluer star very close to the center of the nebula.

The field of view is 2.2 x 3.4 arcminutes with north up (rotated 22 degrees west of north). Image processing by Travis Rector, University of Alaska Anchorage.

A colour composite image, it consists of two narrow-band images ([O III] and hydrogen alpha with three, 500-second integrations each) obtained with the Gemini Multi-Object Spectrograph (GMOS) on the Gemini North telescope on Mauna Kea in Hawai'i.

Below the bright star at left is a barred spiral galaxy in the distant background, careful inspection will reveal several additional distant galaxies in the image.

Gemini Observatory: Most distant Quasar

Artist's conception of how the quasar would appear close up. 

The very hot extremely luminous quasar at the center of the image is very bright at ultraviolet wavelengths, and light from the quasar ionizes the surrounding gas, producing the red color that is characteristic of ionized hydrogen.

Faint compact galaxies that have just been born appear in the background. 

The galaxies' hot stars also ionize their surroundings, but only in the immediate vicinity as they are far less luminous than the quasar which can ionize over a much larger volume. Image Credit: Gemini Observatory/AURA by Lynette Cook

Read more at Gemini Observatory

An international team of astronomers announced today the discovery of the most distant known supermassive black hole, seen as a luminous quasar caused by gas falling into the black hole.

The discovery came to light using data from an ongoing infrared sky survey being conducted at the United Kingdom Infrared Telescope (UKIRT) and critical follow-up confirmation observations with the Gemini North telescope, both on Mauna Kea in Hawai'i. The results are presented in the June 30, 2011 issue of the Journal Nature.

The light from the quasar started its journey toward us when the universe was only 6% of its present age, a mere 770 million years after the Big Bang, at a redshift of about 7.1. "This gives astronomers a headache," says lead author Daniel Mortlock, from Imperial College London.

"It's difficult to understand how a black hole a billion times more massive than the Sun can have grown so early in the history of the universe. It's like rolling a snowball down the hill and suddenly you find that it's 20 feet across!"

However, as well as being a headache, the new quasar is a great opportunity, because it allows scientists to measure the conditions in the gas that the quasar's light passes through on its way to us. "What is particularly important about this source is how bright it is," says Mortlock.

"It's hundreds of times brighter than anything else yet discovered at such a great distance. This means that we can use it to tell us for the first time what conditions were like in the early universe."

NASA Hubble finds Jupiter's hidden Stripe

New Hubble images reveal what happened to one of Jupiter’s main cloud belts: It’s hiding behind ammonia clouds.

“Weather forecast for Jupiter’s Southern Equatorial Belt: cloudy with a chance of ammonia,” planetary scientist Heidi Hammel of the Space Science Institute in Boulder, Colorado said in a press release Wednesday.

The gas giant’s characteristic band of dark clouds started fading late last year and had vanished completely by early May, 2010.

Images taken with Hubble’s Wide Field Camera 3 on June 7 — just over three days after an unknown object smacked into the planet — found a layer of white ammonia ice crystal clouds. The ammonia clouds float at a higher altitude than the missing brown clouds, obscuring them from view.

The images show a preview of what’s to come for the dark stripe, too. A chain of dark spots along the boundary of Jupiter’s south tropical zone peek through the white cloud layer as the ammonia thins and dissipates.

“The Hubble images tell us these spots are holes resulting from localized downdrafts. We often see these types of holes when a change is about to occur,” said planetary scientist Amy Simon-Miller of NASA.

The clouds blocking the famous equatorial stripe should clear out similarly in a couple of months, the team predicts.

“The Southern Equatorial Belt last faded in the early 1970s. We haven’t been able to study this phenomenon at this level of detail before,” Simon-Miller added. “The changes of the last few years are adding to an extraordinary database on dramatic cloud changes on Jupiter.”



The images also provided clues to the identity of the mystery object that hit Jupiter on June 3.

A lack of dark debris at the impact site, which would have been kicked up by the object exploding beneath the clouds, suggests that the object was relatively small and burned up in Jupiter’s atmosphere like a meteor.

“Hubble was only one of several observatories that looked for signs of Jupiter’s impact scar, with more results on their way,” planetary scientist Leigh Fletcher of the University of Oxford noted on Twitter. “Gemini, Keck, VLT and IRTF were all racing to find signs of the impact within hours of the event taking place.”

Star Birth and Gemini Multi-Object Spectograph Hawaii

Sharpless 2-106 as imaged by the Gemini Multi-Object Spectrograph on the Gemini North telescope on Mauna Kea in Hawai‘i.

This color composite image shows the nursery of a massive star (hidden within the cloud) obtained with four narrow-band optical filters available for Gemini users at both Gemini North and South.

Credit: Gemini Observatory/AURA/Travis Rector (U. Alaska Anchorage)

The history of the spacesuit

Is this an early example of the evolution of the mobile phone. It certainly reminds me of some of the Motorola models that I used to sport as a keen young executive about town. No, its some early and cumbersome, spacesuit models. These have certainly developed and improved over the years, thankfully for the astronauts. Here we show you the evolution and history of the spacesuit.


Astronaut John Glenn, the first American to orbit Earth, is shown here in NASA's first spacesuit, designed for the Mercury programme (1958-1963).

The suits were adapted from US Navy pressure suits for high-altitude flights and not designed to be worn on spacewalks. That's because the suits folded in on themselves at the joints, decreasing the volume in the suit. That increased the pressure in the rest of the suit, making it hard for astronauts to bend their legs or arms. As a result, the suits were used only as protection against emergency losses of pressure. (Image: NASA Headquarters)


Spacesuit design took a step forward during NASA's Gemini programme, which featured the agency's first spacewalk on 3 June 1965. To insulate astronauts from the low pressures and temperature extremes of space, Gemini suits boasted extra layers and balloon-like "bladders" filled with gas to maintain pressure, while also maintaining flexibility.

Gus Grissom (left) and John Young, the crew of the first manned Gemini mission, a five-hour orbital flight on 23 March 1965, are shown here in the suits, which are attached to portable air conditioners to keep the astronauts cool. (Image: NASA Johnson Space Center)

The acid test for the Gemini spacesuit came on 3 June 1965, when astronaut Edward White ventured from the capsule for a 23-minute spacewalk - the first such foray for a US astronaut.

White used a gas-powered gun to manoeuvre in space. Oxygen was provided through an 8-metre 'umbilical' cord connected to the Gemini 4 spacecraft. (Image: NASA Johnson Space Center)


To allow lunar explorers greater flexibility, the Apollo suits were built with bellow-like rubber joints at the shoulders, hips, elbows and knees.

Here engineer Bill Peterson fits test pilot Bob Smyth in an early incarnation of the Apollo suit in 1964. The dark straps are part of a restraint harness for the Lunar Excursion Module. (Image: NASA Johnson Space Center)


By the time of the first Moon landing in 1969, the Apollo suits boasted a backpack that provided enough oxygen for breathing, ventilation and suit pressure for 7 hours of Moon walking. Astronaut Buzz Aldrin is pictured here exploring the lunar surface during the Apollo 11 mission. Although the suits performed well in the six missions to land on the Moon, lunar dust became a worry. Astronauts reported that sharp, abrasive lunar dust damaged the suits, wearing through layers and infiltrating seals.

The Apollo suit had to be relatively light so that astronauts could move around in the Moon's gravity and weighed about 82 kg (180 pounds), including its backpack. Later space shuttle suits, by comparison, were more than 1.5 times as heavy - but they were worn in the weightless environment of low-Earth orbit. (Image: NASA Kennedy Space Center)

NASA astronauts now use a two-piece spacesuit for spacewalks called the Extravehicular Mobility Unit (EMU). Unlike the Apollo suits, which were custom-made to fit each astronaut, the EMU has interchangeable parts that can be used to accommodate a range of body sizes.

The EMU is pressurised at about a third of atmospheric pressure, so astronauts must camp out in a relatively low-pressure airlock before spacewalks to remove nitrogen dissolved in the blood and tissues. Moving too quickly to lower pressures can cause that nitrogen gas to create bubbles and obstruct blood flow, which can sometimes be fatal. The suit can weigh about 180 kg (400 lb) and operate for about 8 hours in space. It has a lifetime of 30 years. (Image: NASA Johnson Space Center)

NASA's EMU suits are not the only gear used for spacewalks. Here, astronaut Mike Fincke wears a Russian Orlan suit while performing work outside the International Space Station during the six-month Expedition 9 mission in 2004. (He and cosmonaut Gennady Padalka were originally going to use US suits but discovered problems with the suits, including a failed cooling unit.)

Unlike NASA's EMU suits, which have separate pants and torso sections, Orlan suits are entered through a hatch at the back. That allows astronauts to get into and out of them quickly without assistance. The suit weighs nearly 110 kg (240 pounds), can spend 7 hours in space and is designed to last for 12 spacewalks. (Image: NASA)

China's Feitan suit had a public debut in September 2008, when one of the astronauts aboard the Shenzhou 7 performed the country's first spacewalk.

The spacesuit is reportedly modelled after Russia's Orlan suit. Here one of the Shenzhou 7 crew members emerges from the spacecraft after landing in north China. (Image: China National Space Administration)

Gloves are possibly the most important part of the spacesuit from an astronaut's perspective. In addition to cranking levers and handling power drills, astronauts use their hands - rather than their feet - as their primary mode of "walking" around their spacecraft during spacewalks. The gloves are pressurised, making it difficult for astronauts to move their fingers.

The Apollo spacesuits used two sets of gloves - an inner layer (left) consisting of cloth-covered pressure bladders, and an outer layer made of cloth, Mylar and a metallic mesh. The outer gloves were used on spacewalks to protect against micrometeorites, scratches and heat. (Image: NASA-JSC)

In May 2007, engineer Peter Homer of Southwest Harbor, Maine, won $200,000 when his design for a spacesuit glove beat NASA's in an agency-sponsored competition. His company, Flagsuit LLC, is building on that design and is working with the firm Orbital Outfitters on spacesuits for suborbital tourist trips.

Homer says that unlike current gloves, which are pleated in a way that causes the fingers to curve like a banana, his gloves bend at the same points where our fingers do. That makes it easier for astronauts to move their fingers - important since spacewalks are so labour-intensive that they often leave astronauts' hands bruised and their fingernails bent backwards. (Image: Flagsuit.com)

For decades, NASA has been working intermittently on a next-generation spacesuit that will offer more flexibility and could be used at higher pressures, to eliminate the need for camping out before spacewalks, or breathing in pure oxygen to avoid decompression sickness, or the bends. The Mark III suit (left), one prototype that began development in the late 1980s, boasts a rear-entry system and bearings at the joints to allow astronauts the ability to kneel and perform other tasks.

In the push to return to the Moon, NASA signed a contract in February 2009 with the firm Oceaneering International, Inc, to develop suits for the crew of the shuttle's replacement, the Orion capsule, which is set to fly as early as 2015. Long-time spacesuit developer Hamilton Sundstrand contested the award, but the two firms now plan to work together on the suits, which are intended to share components with a future suit to be designed for the Moon (right). (Image and illustration: NASA)

So far, suits for spacewalks and moonwalks have had to rely on air to maintain pressure around an astronaut's body. But space farers might be able to wear a slimmer design in the future that could allow them to move more freely. This "Biosuit", developed by MIT engineer Dava Newman and colleagues, uses tight layers of material to maintain pressure.

The suit is patterned with stiff lines that do not extend when an astronaut moves a part of their body. These "lines of non-extension" provide a stiff skeleton but do not restrict an astronaut's movement. The team expects it will take several more years of development before the suits can be used in space. Other researchers are developing high-tech spacesuit materials that could one day heal themselves, generate electricity and kill germs. (Image: Donna Coveney)