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CosmicRami's posts Back to profile
4 posts total
CosmicRami

NASA’s latest audacious planetary mission, Europa Clipper, has launched and started its five-and-a-half-year journey to the Jovian system. The target of this mission is the small, icy moon Europa, a world that offers a tantalising possibility that it may be habitable.

Dr. Helen Maynard-Casely examines the path that led to the agency’s largest interplanetary spacecraft to date, and how insights from four historical missions built the case for studying this moon in particular.

spaceaustralia.com/news/europa

#SpaceAustralia #EuropaClipper #Astrodon #SpaceExploration #Europa

📸 New Horizons/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute

NASA’s latest audacious planetary mission, Europa Clipper, has launched and started its five-and-a-half-year journey to the Jovian system. The target of this mission is the small, icy moon Europa, a world that offers a tantalising possibility that it may be habitable.

Dr. Helen Maynard-Casely examines the path that led to the agency’s largest interplanetary spacecraft to date, and how insights from four historical missions built the case for studying this moon in particular.

A small moon is half in shadow as it is rising above the larger planet. The surface of the moon is very smooth and on the planet itself some faint clouds can be seen.
17 October at 22:29 | Open on aus.social
CosmicRami

Moaaar photos I took during our radio school trip to the Australian Telescope Compact Array (ATCA) last week.

📡📡📡📡📡

How many kangaroos can you spot? 🦘

(note - last image is a night shot!)

#Astrodon #RadioAstronomy #Telescopes #Australia #Narrabri

Four large radio telescopes, slightly tilted out in the distance in the field. In the sky there are some clouds and the Moon.
four radio telescope dish antennas off in the distance and pointing away at the sky
A kangaroo hops over some broken sticks in the foreground, whilst out in the distance are three large radio telescopes
four radio telescope dish antennas off in the distance and pointing away at the sky
1 Oct 2023 at 22:42 | Open on aus.social
CosmicRami

🚨BIG SCIENCE NEWS 🚨

And our results (along with our international colleagues) have dropped!

Our team (and others) have started to see the strongest evidence as yet of the stochastic gravitational wave background - ripples in space-time cause by ALL the supermassive black holes in the history of the Universe colliding!

We use pulsars to study these riplles and we needed almost 20 years of data to even get the first hints! It's the long game!

I'm a co-author on the Aussie papers (as part of my work) but I also wrote about it here in my latest feature article on #SpaceAustralia

This is why I have been going on about pulsars for a few weeks now - this was coming!

Check it out here: spaceaustralia.com/feature/aus

📸 Shanika Galaudage

#Astrodon #Astrophysics #RadioAstronomy #GravitationalWaves #Science #Pulsars

🚨BIG SCIENCE NEWS 🚨

And our results (along with our international colleagues) have dropped!

Our team (and others) have started to see the strongest evidence as yet of the stochastic gravitational wave background - ripples in space-time cause by ALL the supermassive black holes in the history of the Universe colliding!

Graphic showing the Earth at the centre of a warped space-time grid. On the grid, surrounding the Earth are several pulsars whose beams are being distorted with space-time. In the distance, and on the edges of the image, are swirling binary black holes.
29 Jun 2023 at 4:10 | Open on aus.social
CosmicRami

The smoking gun signature of detection is this violin plot, known as the Hellings & Downs correlation. It tells us that all the pulsars across the sky are showing a correlated signal that is expected to be produced by the gravitational wave background of supermassive black hole binaries.

We're seeing the Universe shake, rattle and rolling!

Interestingly, data from our PPTA paper - the amplitude signal strength is time-dependent, which is not expected if gravitational wave signals are equally isotropic.

Could be a processing issue, or the pulsars (weirdos) OR potentially GWs stronger in one part of the sky! 🤯

This is wild to me!

#Astrodon #Astrophysics #RadioAstronomy #GravitationalWaves #Science #Pulsars

📸Reardon et al. 2023

The smoking gun signature of detection is this violin plot, known as the Hellings & Downs correlation. It tells us that all the pulsars across the sky are showing a correlated signal that is expected to be produced by the gravitational wave background of supermassive black hole binaries.

We're seeing the Universe shake, rattle and rolling!

a plot that shows eight violin plots that are green and inflated towards their centres. They follow a curved line from left to right. In the background are several grey histogram boxes.
Two plots side by side. Both have an x-axis that runs from 2004 to 2022. The y-axis indicates the amplitude of the gravitational wave signal. In the left graph there are violin plots in orange and purple. The orange violins sink a little before the purple start and commence rising. On the right graph, the orange violins are already lower than the purple, and so everything is rising towards the right.
29 Jun 2023 at 4:13 | Open on aus.social
CosmicRami

There's been a bit of discussion recently around the potential development of a 'Lunar Timezone', in response to a new era of exploration and growth around our celestial companion.

I certainly think we need to cut the terrestrial umbilical cord of timekeeping away from Earth (this is hard) as we step out into the Solar System (be that humans or robots), but I am thinking bigger.

Instead of just a Lunar time zone, how can we build scalability and universality?

One time system to rule them all.

Thankfully, nature has given us just the tools ..... PULSARS.

My latest feature article for #SpaceAustralia on building a Galactic timekeeping system using pulsars.

spaceaustralia.com/feature/bre

#RadioAstronomy #Pulsars #Navigation #Timing #Positioning #TimeKeeping #Astrodon

There's been a bit of discussion recently around the potential development of a 'Lunar Timezone', in response to a new era of exploration and growth around our celestial companion.

I certainly think we need to cut the terrestrial umbilical cord of timekeeping away from Earth (this is hard) as we step out into the Solar System (be that humans or robots), but I am thinking bigger.

Lunar surface in the foreground, with craters and mountains shadowed. In the distance, the Earth, half illuminated.
9 Mar 2023 at 4:45 | Open on aus.social
John Bell 🇺🇦🇪🇺🔸🕷️🏴󠁧󠁢󠁷󠁬󠁳󠁿

@CosmicRami certainly makes a lot of sense. The UTC timezone is related to the tropical year on earth, so would not be easy to measure for an observer who is not on the Earth.
Are pulsars stable enough over a long time frame? My thoughts would be that there is a risk that the rotation speed would vary if there is any mass accretion

9 Mar 2023 at 6:39 | Open on mastodonapp.uk
Al

@CosmicRami Now here is a big thinker, I like it. tell us more

9 Mar 2023 at 10:42 | Open on mastodon.sdf.org
Denis Grodent
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