On one of the largest panoramic views of star birth, astronomers using the ultraviolet vision of NASAs Hubble telescope have assembled an image that features approximately 15,000 galaxies, about 12,000 of which are forming stars.
This image is a portion of the GOODS-North field, which is located in the northern constellation Ursa Major, NASA said in a statement Thursday.
The image straddles the gap between the very distant galaxies, which can only be viewed in infrared light, and closer galaxies, which can be seen across a broad spectrum.
The light from distant star-forming regions in remote galaxies started out as ultraviolet, but the expansion of the universe shifted the light into infrared wavelengths.
By comparing images of star formation in the distant and nearby universe, astronomers glean a better understanding of how nearby galaxies grew from small clumps of hot, young stars long ago, NASA said.
Because Earth’s atmosphere filters most ultraviolet light, Hubble can provide some of the most sensitive space-based ultraviolet observations possible. (IANS)
Chinese researchers have found that solar cells can retain most of their power conversion efficiency in near space, providing perspectives on the cells’ future application in space.
Perovskite solar cells (PSCs) are known for their potential of achieving higher efficiency and low production costs compared to traditional silicon solar cells.
These cells also have great potential for developing the new-generation energy technology for space application, but little research has been done to test the stability of PSCs in the extreme space environment, Xinhua news agency reported.
In the study, researchers from China’s Peking University sent the devices fixed with PSCs into near space on a high-altitude balloon.
The balloon rose to near space at an altitude of 35 km, a region above Earth’s atmosphere where there is only a trace amount of moisture and ozone.
The region, considered to have “air mass zero” contains no atmospheric attenuation of solar radiation and therefore several high-energy particles and radiation, such as neutrons, electrons and gamma rays, originate from the galactic cosmic rays and solar flares.
According to the findings, one type of PSCs used in the study retained more than 95 per cent of its initial power conversion efficiency during the test, the researchers reported in the journal Science China Physics, Mechanics and Astronomy.
They said the study is expected to play a crucial role in the future stability research of PSCs. (IANS)