1/4
The img shows the inner region of Abell 1689, an immense cluster of galaxies located 2.2 billion ly away in constellation Virgo.
Astronomers used Hubble to map the distribution of dark matter in the galaxy cluster. ➡️bit.ly/3tVdSzz

#scritturebrevi #VentagliDiParole 2/4
Here is Abell 1689, with the mass distribution of the dark matter in the gravitational lens overlaid (in purple).

The mass in this lens is made up partly of normal (baryonic) matter and partly of dark matter.

➡️bit.ly/35WKCjZ

#scritturebrevi #VentagliDiParole

In the face of this terrible tragedy, we must remain cohesive and invoke the ideals of democracy, solidarity and universal brotherhood by strongly saying #StopWarInUkraine #Peace .

Image source➡️nyti.ms/3MfVWIl

#scritturebrevi #VentagliDiParole #ThePhotoHour #StopWar I invite you to carefully read the entire thread: one by one the 12 tweets.

#StopWar #UkraineRussiaWar

#scritturebrevi #ventaglidiparole

https://twitter.com/navalny/status/1498948871514435588

Thread
1/
A diffuse glow of high-energy gamma rays hints at the presence of powerful cosmic accelerators, called PeVatrons, within the disk of our Galaxy.

Paper➡️bit.ly/32km2nX
Article➡️bit.ly/3wLzyPf

Img credit: Heasarc/Lambda/NASA/GFSC

#Space #Astrophysics 2/
Many physicists believe that such #PeVatrons accelerate particles up to at least PeV energies (PeV=10^15 eV).

Possible PeVatrons include #supernova explosions, star-forming regions, & Sgr A* the supermassive black hole at the center of our galaxy.

#Space #Astrophysics