Optical Illusion: How Dense Gas Masquerades as Metal-Poor Galaxies
In a distant galaxy, light from hot gas should reveal its composition. The James Webb Telescope split that light into a spectrum, and astronomers saw: oxygen lines too weak.
Radio Bursts to Map the Invisible Universe
A flashlight beam cuts through fog. The denser the fog, the more the light scatters and the later it reaches your eye. A similar principle works with fast radio bursts — mysterious, super-powerful pulses from distant galaxies. As their radio waves travel through space, they interact with free electrons — particles stripped from atoms.
Earth as a Dark Matter Detector: Hunting Charged Relics
Dark matter — the invisible architect of the universe, holding galaxies from flying apart. Thanks to the pioneering work of Fritz Zwicky and Vera Rubin we know: ordinary matter in the cosmos is just a negligible impurity. But what lies behind this dark matter?
Nebula Orchestra: Why Lines Hear Different Densities
The Orion Nebula is a showcase of astrophysics, a laboratory for studying star formation right in our backyard. For over a century, its light has been split into spectra, and each forbidden line whispers its own version of how many electrons per cubic centimeter.
Cosmic Lightning: How Fast Radio Bursts Illuminate Hidden Baryons
Half a century ago, Fritz Zwicky noticed that the visible matter in galaxy clusters was catastrophically insufficient to explain gravity.
Sponge-Like Nebulae
The glowing hydrogen clouds in other galaxies are like a sponge: the gas itself takes up only a small fraction of the volume, and the rest is nearly empty space. For a long time, astronomers could only guess how 'holey' these nebulae are. Now a team of scientists has proposed a way to measure it.
The Solar Corona: A New Way to Measure Its Density
The solar corona, the Sun's outer atmosphere, stretches millions of kilometers, yet it's visible only during a total eclipse or with specialized instruments. Typically, we gauge the corona's density by how it scatters white light, but that method relies on simplifications that can skew the results.
Turbulence in Space: How Clouds Change the Chemistry of Stars
A boiling cauldron: steam rises, water churns, and the temperature varies from point to point. So it is in space: the gas clouds around young stars are not smooth spheres but a seething mixture with vortices and density fluctuations. Astronomers long treated such clouds as homogeneous, but this simplification can skew conclusions.