Symmetry

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What we know about dark matter

There are a lot of things scientists don’t know about dark matter: Can we catch it in a detector? Can we make it in a lab? What kinds of particles is it made of? Is it made of more than one kind of particle? Is it even made of particles at all? Still, although scientists have yet to find the spooky stuff, they aren’t completely in the dark.

On background

To some degree, scientists on all of today’s particle physics experiments share a common challenge: How can they pick out the evidence they are looking for from the overwhelming abundance of all the other stuff in the universe getting in their way? Physicists refer to that stuff — the unwelcome clamor of gamma rays, cosmic rays and radiation crowding particle detectors — as background. They deal with background in their experiments in two ways: by reducing it and by rejecting it.

Fine-tuning versus naturalness

    When observed parameters seem like they must be finely tuned to fit a theory, some physicists accept it as coincidence. Others want to keep digging.

    When kids interview scientists

      Science Storytellers brings together two groups of innately curious individuals: scientists and children. In the Science Storytellers program, kids act as science journalists interviewing real-life scientists. Afterward, they share what they learned. Research shows that transmitting scientific knowledge to the public is important, but actually shifting someone’s opinions requires engaging with them in a two-way dialogue and treating them as a whole, complicated person with knowledge, experiences and influences of their own.

      The other dark matter candidate

        As technology improves, scientists discover new ways to search for theorized dark matter particles called axions. Four decades after they were first theorized, axions are enjoying a moment in the sun, and may even be on the verge of detection, poised to solve two major problems in physics at once.

        Drag racing and black hole physics

          The first undergraduate on the Event Horizon Telescope to receive junior collaborator status thrives in the unknown. In his nearly two years with the team, he has developed computer libraries for data analysis and modeling, made movies of black holes and assisted with weather prediction.