AAS NOVA — Research Highlights 2019

Find out the latest thinking about our universe.
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bystander
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Tracking Variations in Venus’s Clouds

Post by bystander » Tue Dec 31, 2019 8:53 pm

Tracking Variations in Venus’s Clouds
NOVA | American Astronomical Society | 2019 Dec 23
Susanna Kohler wrote:
A new study led by Yeon Joo Lee (The University of Tokyo, Japan) has used an entire suite of instruments — Venus Express, Akatsuki, MESSENGER, and the Hubble Space Telescope — to study the long-term reflectivity of Venus’s atmosphere. They find that, over the timescale of roughly a decade, variations in the ultraviolet albedo of the atmosphere cause significant changes in aspects of Venus’s climate, like windspeeds at the planet’s cloud tops. ...

Long-term Variations of Venus's 365 nm Albedo Observed by Venus Express,
Akatsuki, MESSENGER, and the Hubble Space Telescope
~ Yeon Joo Lee et al
viewtopic.php?t=39741
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bystander
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An Alternative to Planet Nine

Post by bystander » Tue Dec 31, 2019 9:01 pm

An Alternative to Planet Nine
NOVA | American Astronomical Society | 2019 Dec 26
Susanna Kohler wrote:
Scientists Antranik Sefilian (University of Cambridge, UK) and Jihad Touma (American University of Beirut, Lebanon) have demonstrated that the odd clustering of orbits we observe in the outer reaches of our solar system could be explained by the collective gravity of a large disk of trans-Neptunian objects — small, icy bodies beyond the orbit of Neptune. ...


Shepherding in a Self-Gravitating Disk of Trans-Neptunian Objects ~ Antranik A. Sefilian, Jihad R. Touma
viewtopic.php?p=289141#p289141
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bystander
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Discovery of an Intermediate-Mass Black Hole

Post by bystander » Tue Dec 31, 2019 9:06 pm

Discovery of an Intermediate-Mass Black Hole
NOVA | American Astronomical Society | 2019 Dec 27
Susanna Kohler wrote:
By analyzing the internal motions of a cloud of molecular gas using the Atacama Large Millimeter/submillimeter Array (ALMA), a team of scientists led by Shunya Takekawa (Nobeyama Radio Observatory, NAOJ, Japan) has found evidence for a 30,000 solar-mass black hole drifting near our galaxy’s center. ...

Indication of Another Intermediate-Mass Black Hole in the Galactic Center ~ Shunya Takekawa et al
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bystander
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Connecting the Universe’s Large and Small Scales

Post by bystander » Tue Dec 31, 2019 9:11 pm

Connecting the Universe’s Large and Small Scales
NOVA | American Astronomical Society | 2019 Dec 30
Susanna Kohler wrote:
Two scientists at University of Hawai’i at Mānoa, Kevin Croker and Joel Weiner, have reexplored Friedmann’s equations — the set of equations that describe the expansion of the universe — under a different set of fundamental assumptions. Using their revised formalism, they show that the universe’s growth rate can be influenced by the relatively small pressure contributions of compact objects left behind after a star’s death. ...


Implications of Symmetry and Pressure in Friedmann Cosmology. I. Formalism ~ K.S. Croker, J.L. Weiner
viewtopic.php?t=39861
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Re: Are There More Stars Like Boyajian’s Star?

Post by neufer » Wed Jan 05, 2022 2:07 pm

Click to play embedded YouTube video.
Art Neuendorffer