Tuesday March 19, 2019
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NASA’s Osiris-Rex Sends Pictures Of Asteroid Bennu

Next year, Osiris-Rex will attempt to gather some samples from the carbon-rich asteroid, for return to Earth in 2023.

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Space, Asteroid bennu
This image captured on Dec. 19, 2018, by a camera on the Osiris-Rex spacecraft shows the asteroid Bennu, top right, about 27 miles (43 kilometers) from the spacecraft, and the Earth and moon, bottom left, more than 70 million miles (110 million kilometers. VOA

An asteroid-circling spacecraft has captured a cool snapshot of home.

NASA’s Osiris-Rex spacecraft took the picture days before going into orbit around asteroid Bennu on New Year’s Eve.

The tiny asteroid — barely one-third of a mile (500 meters) across — appears as a big bright blob in the long-exposure photo released last week. Seventy million miles (110 million kilometers) away, Earth appears as a white dot, with the moon an even smaller dot but still clearly visible.

OSIRIS-REx, NASA, Asteroid bennu
This illustration provided by NASA depicts the Satellite in the space.

Osiris-Rex is the first spacecraft to orbit such a small celestial body, and from such a close distance — about a mile (1,600 meters) out.

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Next year, Osiris-Rex will attempt to gather some samples from the carbon-rich asteroid, for return to Earth in 2023.

Osiris-Rex launched from Florida in 2016. (VOA)

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Study Reveals Solar Cells Can Retain Most Of Their Power Conversion Efficiency in Near Space

In the study, researchers from China's Peking University sent the devices fixed with PSCs into near space on a high-altitude balloon.

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solar energy
Perovskite solar cells (PSCs) are known for their potential of achieving higher efficiency and low production costs compared to traditional silicon solar cells. Pixabay

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.

energy
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. Piixabay

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.

solar cells
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.
Pixabay

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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)