Category Astronomy/Space

A new look at Sunspots

Scientists created light curves using the high-resolution images of the Sun to understand what a sunspot would look like on a distant star. They studied different layers of the Sun from the visible surface to the outer atmosphere using 14 different wavelengths, including the six shown here (top left to right: photosphere, magnetic flux of the photosphere, ultraviolet 304 angstroms; bottom left to right: ultraviolet 171 angstroms, ultraviolet 131 angstroms, x-ray).
Credits: NASA/SDO/JAXA/NAOJ/Hinode

NASA’s extensive fleet of spacecraft allows scientists to study the Sun extremely close-up — one of the agency’s spacecraft is even on its way to fly through the Sun’s outer atmosphere. But sometimes taking a step back can provide new insight.

In a new study, scientists looked at sunspots ...

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Signals from Distant Stars Connect Optical Atomic Clocks across Earth for the first time

Fig.
Antennas and optical lattice clocks used in the measurements

Upper left: Transportable 2.4 m antenna installed at the INAF radio observatory in Medicina, Italy.
Upper middle: Transportable 2.4 m antenna installed at NICT in Koganei, Japan.
Upper right: 34 m antenna located at NICT in Kashima, Japan.
Bottom left: The ytterbium optical lattice clock IT-Yb1, operated at INRIM in Torino, Italy.
Bottom right: The strontium optical lattice clock NICT-Sr1, located at NICT in Koganei, Japan.

Transportable radio telescopes could provide global high-precision comparisons of the best atomic clocks. Using radio telescopes observing distant stars, scientists have connected optical atomic clocks on different continents...

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Moon’s Magnetic Crust research sees scientists Debunk Long-held Theory

The Moon ©NASA

New international research into the Moon provides scientists with insights as to how and why its crust is magnetised, essentially ‘debunking’ one of the previous longstanding theories.
Australian researcher and study co-author Dr Katarina Miljkovic, from the Curtin Space Science and Technology Centre, located within the School of Earth and Planetary Sciences at Curtin University, explained how the new research, published by Science Advances, expands on decades of work by other scientists.
“There are two long term hypotheses associated with why the Moon’s crust might be magnetic: One is that the magnetisation is the result of an ancient dynamo in the lunar core, and the other is that it’s the result of an amplification of the interplanetary magnetic field, created by meteo...

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Trans-Neptunian Object Arrokoth: Flattening of a Snowman

Arrokoth’s flattened shape can only be seen from a certain perspective. The first images returned by NASA’s New… [more]
© NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute

Only in the course of several million years did Arrokoth, also known by its nickname Ultima Thule, acquire its bizarre, pancake-flat shape. The trans-Neptunian object Arrokoth, also known as Ultima Thule, which NASA’s space probe New Horizons passed on New Year’s Day 2019, may have changed its shape significantly in the first 100 million years since its formation...

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