Example of stellar shells and tidal streams in the halo of nearby galaxies from ground-based images. ARRAKIHS will allow imaging 10 times deeper.
Example of stellar shells and tidal streams in the halo of nearby galaxies from ground-based images. ARRAKIHS will allow imaging 10 times deeper. Martinez, Delgado et al. The ARRAKHIS consortium, for which EPFL has the science lead, has just successfully passed the mission definition review of the project, a very important first milestone towards full completion of the mission preparation. ARRAKIHS is a satellite selected by ESA to address the nature of dark matter, to be launched in 2030. When you look at the night sky, some of the stars bare witness to early formation stages of the universe and can belong to the first small galaxies formed. These structures are extremely faint in the night sky, and our current understanding is that they are also dominated by dark matter.
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