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Thursday, March 16, 2023

Gravitational waves may be from fractures in space-time

Created for znamenski.spacecom@blogger.com | Web Version

March 16, 2023

CONNECT WITH SPACE.COM

Something amazing every day.

The Launchpad

Pluto probe makes 3 more discoveries in solar system

(NASA/JHUAPL/SwRI)

New findings keep on coming from the mission's July 2015 Pluto flyby.

Full Story: Space (3/16)

Gravitational waves may be from fractures in space-time

$Gravitational waves may be from fractures in space-time$

(Victor de Schwanberg/Science Photo Library/Getty Images)

The early universe may have been such a violent place that space-time itself fractured like a pane of glass, releasing gravitational waves that astronomers say we may have already detected.

Full Story: Space (3/15)

POLL QUESTION:

Space quiz! NASA's Pluto probe flew by the dwarf planet nearly eight years ago, but the epic encounter is still bearing scientific fruit. What is the name of this probe?

Learn the answer here!

Space Deal of the Day

Telescope deal: The Celestron Travelscope 60 is under $40

(Celestron)

You'll do well to discover a telescope this good at this price again, the Celestron Travelscope 60 is now just $38, saving over $60.

Full Story: Space (3/16)

Skywatching

Orion goes from hunter to hunted in the March night sky

(Mark Garlick/Science Photo Library/Getty Images)

The constellation of Orion represents the hunter for most of the year, but in mid-March, this prominent collection of stars becomes hunted by skywatchers.

Full Story: Space (3/16)

Spaceflight

1st Artemis spacesuits on the moon will not return to Earth

(collectSPACE.com)

'The spacesuits will go back on Starship, and then Starship will remain in [lunar] orbit indefinitely.'

Full Story: Space (3/15)

Astronaut wants the world to 'share in that joy'

(SpaceX)

Shortly after coming home from the International Space Station, NASA's Nicole Mann talked about how she is trying to bring others into the field by sharing her journey.

Full Story: Space (3/15)

Science & Astronomy

Active volcano spotted on Venus. The planet's not dead yet.

(NASA/JPL-Caltech)

The latest finding marks the first time that scientists have found direct evidence of recent volcanic activity on the surface of Venus, Earth's closest neighbor.

Full Story: Space (3/16)

SpaceX

SpaceX Dragon arrives at space station with NASA supplies

(NASA)

The capsule docked with the space station at 7:31 a.m. EDT on Thursday (March 16).

Full Story: Space (3/16)

Entertainment

Queen guitarist and astrophysicist Brian May knighted

(Victoria Jones - WPA Pool/Getty Images)

The legendary musician, activist and scientist was honored at Buckingham Palace this week.

Full Story: Space (3/15)

Star Trek

'Picard' features the brief return of a 'TNG' favorite

(Paramount Plus)

Fans will squeal as a beloved B-character makes her 'Trek' encore - and then just as quickly makes her 'Trek' exit.

Full Story: Space (3/16)

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Seminars Digest, Vol 52, Issue 3

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Today's Topics:

1. Friday 17.03.2023 (Serge Krashakov)

----------------------------------------------------------------------

Message: 1
Date: Wed, 15 Mar 2023 21:12:22 +0300
From: Serge Krashakov <sakr@itp.ac.ru>
To: staff@itp.ac.ru, students@itp.ac.ru, seminars@itp.ac.ru
Subject: [Landau ITP Seminars] Friday 17.03.2023
Message-ID: <c670cb6c-8c82-b08c-9ee6-e0e7664924df@itp.ac.ru>
Content-Type: text/plain; charset="utf-8"; Format="flowed"

Уважаемые коллеги!

На заседании Ученого совета в пятницу 17 марта в 11:30 будут заслушаны
2 доклада:

1) С.И. Матвеенко
*Ротоны в Бозе-конденсате дипольных атомов.*

Найдены аналитические и численные решения для спектров возбуждений
ротонного типа в квазиодномерном Бозе-конденсате магнитных дипольных
атомов. Вычислен коэффициент затухания возбуждений при конечной
температуре. Результаты могут быть применимы к конденсату атомов
диспрозия, для которого показано, что ротонные возбуждения достаточно
долгоживущие и могут быть наблюдаемы.

2) Н.А. Иногамов
*Структурирование поверхности кремния с помощью фемтосекундного импульса
и дифракции на микропузырьке*. (короткий доклад)

Laser-assisted nanostructuring of silicon interfaces provides a unique
procedure for leading-edge technologies. We report on a new embossing
technique with tightly focused Gaussian-shaped ultrashort laser pulses
near the ablation threshold in liquid. We take advantage of a primary
microbubble for controllable spatial-modulation of light intensity of
succeeding pulses. Such a bubble, generated in liquid near the molten
silicon surface by the first pulse, serves as an obstacle for the second
pulse following with a sub-millisecond time delay, to produce a
diffraction ring pattern. Variation of laser intensity can be utilized
to guide the diffraction patterns. Thus the various annular patterns
deeply embossed up to hundreds nanometers on the surface are produced
with high reproducibility. Morphology of modified surface layer is
investigated in detail using atomic-force microscopy, as well as
scanning and transmission electron microscopies. Full-wave EM modeling
of laser beam diffraction by the bubbles with various radii and shapes
shows that the peak intensity in silicon is up to 1.7 times higher than
in bubble-free liquid. Atomistic simulation of ultrafast heating with
such a diffraction peak reveals that an annular microdimple surrounded
by rims is formed by high-gradient pressure in molten silicon to be
frozen after several nanoseconds.
S.A. Romashevskiy, A.I. Ignatov, V.V. Zhakhovsky, E.M. Eganova, E.A.
Pershina, N.A. Inogamov, S.I. Ashitkov, Embossing of silicon with an
ultrashort laser pulse diffracted by a bubble in liquid, Applied Surface
Science, 615, 156212 (2023)

ID и пароль онлайн-трансляций в Zoom те же, что и для предыдущих
трансляций докладов на Ученом совете:
https://zoom.us/j/96899364518?pwd=MzBsR2lYT0lYL2x2b1oyNU9LeWlWUT09
Meeting ID: 968 9936 4518
Пароль: 250319

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Wednesday, March 15, 2023

Webb telescope spots huge star about to go supernova

Created for znamenski.spacecom@blogger.com | Web Version

March 15, 2023

CONNECT WITH SPACE.COM

Something amazing every day.

The Launchpad

Perseverance rover films Ingenuity helicopter flight

(NASA/JPL-Caltech)

The helicopter made its 47th flight, putting it well within sight of making 50 launches on the Red Planet.

Full Story: Space (3/14)

Webb telescope spots huge star about to go supernova

(NASA, ESA, CSA, STScI, Webb ERO Production Team)

The star is about 30 times more massive than our sun and has already shed 10 suns' worth of gas and dust.

Full Story: Space (3/14)

POLL QUESTION:

Space quiz! NASA's James Webb Space Telescope has spied on a giant star's dying days. What is the name of rare stars that are in the process of casting off their outer layers, resulting in characteristic halos of gas and dust?

Learn the answer here!

Space Deal of the Day

One of the best binoculars for kids on sale now just $30

(Tantse Walter)

At almost half price, we've named the Occer 12x25 after we were happily impressed during our review so we'd recommend this deep discount while stocks last

Full Story: Space (3/14)

Skywatching

Gamma Normid meteors peak for southern hemisphere

(Douglas Cliff/Getty Images)

The annual meteor shower known as the Gamma Normids (γ-Normids) peaks this year on Wednesday (March 15), providing a challenging target for patient Southern Hemisphere skywatchers.

Full Story: Space (3/15)