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Nearly 50 'ghost galaxies' emerge around three hosts, challenging dwarf galaxy counts

Dwarf galaxies—with a mass equal to about a billion suns, but often considerably less—are the most abundant in the universe. However, because of their low luminosity, they are very difficult to detect. They have mostly been discovered in the vicinity of the Milky Way, in what is called the Local Group, but also, and in large quantities, at greater distances, where current instrumentation cannot distinguish individual stars.

Phys.orgPhys.org10h ago

A third of Americans cannot name the three branches of government

Over a third of U.S. adults (35%) cannot name all three branches of the government, and under half can name four of the five rights protected by the First Amendment, according to the 2026 Annenberg Constitution Day Civics Survey from the Annenberg Public Policy Center (APPC) of the University of Pennsylvania. Of the five First Amendment rights, only freedom of speech is identified by more than half of survey respondents.

Phys.orgPhys.org11h ago

New simulations link unusual particle diffusion to yielding in soft jammed matter

Soft materials such as colloidal suspensions, emulsions, foams and gels often display complex and unusual behaviors compared with ordinary solids or liquids. From a mechanical point of view, for instance, they can resist deformation like solids, but they can also start to flow like liquids when a sufficiently strong external drive is applied. This transition from solid-like to liquid-like behavior, known as "yielding," is central to the physics of soft amorphous materials and to many industrial and biological processes.

Phys.orgPhys.org14h ago