what the first webb pix tell us about dark matter

Skip to first unread message


Jul 29, 2022, 7:48:22 AMJul 29
I *like* this kid. :)


Life Not As We Know It: Probing the Nature of Dark Matter

Avi Loeb
26 Jul 2022
The Debrief

Our scientific knowledge is spotty, like islands in an ocean of
ignorance. The best visual illustration of this state of affairs is
the "deep image" from the Webb Telescope, revealed in a public
announcement at the White House on July 11, 2022.

The image shows a cluster of galaxies that lenses gravitationally the
wallpaper of dwarf galaxies from up to 13.1 bn years ago. The
starlight appears in the image as bright islands on a dark background.
But the gravitational lensing effect is dominated by the dark ocean of
matter surrounding the starlight. If this dark matter were luminous
and ordinary matter were dark, the image would have been far brighter,
looking like the sky on a sunny day, filled with light and peppered
with tiny dark clouds. But Webb's image is the opposite of that,
telling us that what we know is less than what we have to learn.

It is a signature of human-centrism to presume that most of the
interesting action in the Universe involves the minority of matter
that we see, just because we are familiar with it from our Solar
system. Such a bias echoes the mindset of an infant who imagines that
there is nothing exciting outside home.

So far, all our attempts to produce dark matter in particle
accelerators by smashing familiar particles with high energies at each
other failed. At the same time, the history of relativity and quantum
mechanics suggests that nature is more imaginative than we are.

The simplest assumption to make is that dark matter particles do not
scatter off each other, just as they do not scatter off ordinary
matter. This assumption leads to tensions between theory and
observations of dwarf galaxies. These are the building blocks of
galaxies like our Milky Way, which was assembled out of mns of
dwarf galaxies at early cosmic times. Observing these Lego pieces
directly would allow us to probe the nature of dark matter.

The potential for discovery with the Webb Telescope is great, keeping
in mind that its deep image was obtained with an exposure lasting half
a day. Extending the exposure time to 3 weeks, as was done with
Hubble's eXtreme Deep Field, would allow the Webb Telescope to detect
dwarf galaxies that are 6 times fainter than those seen in its
preliminary deep image.


"Nothing in life is to be feared, it is only to be understood.
Now is the time to understand more, so that we may fear less."
- Marie Curie

[So Cute!]
Kangaroo attack leaves 67-year-old woman with a broken leg
ABC Sunshine Coast, 29 Jul 2022 07:46Z
The woman's daughter says her mother could have died if it were not for
those who raced to her aid.

Pentagon creating UFO sighting investigation office
American Military News, 28 Jul 2022
The Pentagon announced last week that it is establishing an office that will
focus entirely on investigating UFO sightings.

Hunting UFOs for the Government
BBC, 21 Jul 2022 11:37Z
Secretariat (Air Staff) was an official govt position hunting for
UFOs. For his new BBC 5 Live series, Different, Nicky ...

Pentagon establishes office to track UFOs in space
The Dept of Defense has created an office to track unidentified objects in space and air, under water, or even those ...
[The data shows interactions between UFO's and "military aircraft"
strongly suggest they see them coming from deep space and pre-position
for the chase. Not to mention nightly chases involving light aircraft
and lights in the sky in sem-rural Victoria].

House committee advances legislation including deeper look into govt
UFO reports
Fox News, 22 Jul 2022 01:34Z
The House Intelligence committee voted to send the Intelligence
Authorization Act for a full vote, including provisions that ...

How a UFO `got into a DOGFIGHT with a US fighter plane for 30 minutes in
400mph chase that left his jet radioactive'
The Sun, 21 Jul 2022 16:26Z
A US fighter pilot was reportedly left shaken after he spent 30 minutes
duelling in the sky with a white shape that appeared ...

Pentagon renames UFO office, expands mission to include `transmedium' objects
Defense News, 20 Jul 2022 22:53Z
Congress held its first hearing on UFOs in over a half centure. During the
hearing, lawmakers questioned Pentagon officials ...
[All Domain Anomaly Resolution Office -- AARO. Sounds serious!]

New research ranks Washington as top state for UFO sightings
YAHOO!News, 19 Jul 2022 18:36Z
The team at online jigsaw site looked at data from the National UFO
Reporting Center to find the total number of UFO ...

Reply all
Reply to author
0 new messages