Articles on Galaxies

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Illustration of the distant galaxy 8 billion light-years away (red), magnified by an unrelated foreground disk galaxy, resulting in a red ring. Splitting up the radio light into different colours, as a prism does, reveals the hydroxyl gigamaser (top-right rainbow-coloured line). Inter-University Institute for Data-Intensive Astronomy (IDIA)

South African telescope detects record‑breaking signal from the early universe

Scientists have discovered the most distant hydroxyl megamaser ever detected. This is a natural space laser.
This artist’s impression shows two tiny but very dense neutron stars at the point at which they merge and explode. ESO/L. Calçada/M. Kornmesser

Astrophysicists trace the origin of valuable metals in space, from colliding stars to merging galaxies

Gold and platinum are found in space, created when two stars collide. Astrophysicists can even trace this process further back, to the merger of galaxies.
A runaway black hole leaving a streak of new stars in its wake. James Webb Space Telescope / van Dokkum et al.

New fear unlocked: runaway black holes

Astronomers have spotted runaway black holes screaming through space, leaving trails of stars in in their wake.
Spiral galaxies, like Messier 77 shown here, helped astronomers learn about the existence of dark matter. NASA, ESA & A. van der Hoeven

How are dark matter and antimatter different?

Normal matter – which makes up everything we see and touch – isn’t the only type of matter present in the universe.
In space, there are four dimensions: length, width, height and time. scaliger/iStock/NASA via Getty Images Plus

Where is the center of the universe?

As the universe expands, it feels like it must be spreading out from some initial point. But a physicist explains why that’s not how it works. Hint: space-time is involved.
One of the galaxies mapped by WALLABY: the red shade shows the atomic hydrogen gas content of the galaxy, overlaid on an optical image showing the stars. Much of it is typically found beyond the stellar disk (thin white line), where star formation takes place. Legacy Surveys / D. Lang (Perimeter Institute) / T. Westmeier

For making stars, it’s not just how much gas a galaxy has that matters – it’s where it’s hiding

A new, more detailed study of 1,000 distant galaxies explains why some gas-rich galaxies don’t produce as many stars as you’d expect.

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