Articles on Galaxies

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Jets generated by supermassive black holes at the centers of galaxies can transport huge amounts of energy across great distances. REUTERS/X-ray: NASA/CXC/Tokyo Institute of Technology/J.Kataoka et al

Radio galaxies: the mysterious, secretive “beasts” of the Universe

It's difficult to get jets - powerful, lightning fast particles - to give up their secrets. The new Square Kilometre Array radio telescope could hold the key to solving jets' mysteries.
The new discovery: The C-shaped “wide angle tail galaxy” (pink) surrounded by the galaxies of the Matorny-Terentev cluster (white). Julie Banfield

How citizen scientists discovered a giant cluster of galaxies

The find by citizen scientists of at least 40 galaxies in a cluster more than a billion light years away is the astronomical equivalent of finding a needle in a haystack.
Can a galaxy (like NGC 3810 in this case) have a classical spiral structure and also be already dead? ESA/Hubble and NASA

Is our Milky Way galaxy a zombie, already dead and we don’t know it?

Extragalactic astrophysicists want to know how and why galaxies stop forming stars, change their shape and fade away. With help from citizen scientists, they're figuring it out.
Supermassive black holes, containing as much mass as millions or billions of suns, exist at the centre of all galaxies, including our own Milky Way. NASA Goddard Space Flight Center

Speaking with: Meg Urry on supermassive black holes

Tanya Hill speaks with Meg Urry about distant galaxies and the supermassive black holes that lurk in their centres.
There are so many galaxies, you can write with them! writing.galaxyzoo.org/

Citizen scientists discover what’s out there

It’s National Science Week and this year the annual citizen science project run by ABC Science is astronomy-themed. No guesses for knowing that I’m excited about that! It’s also a nod to 2015 being the…
A composite image of Centaurus A which has a dwarf galaxy ESO 324-G024 nearby. X-ray: NASA/CXC/SAO; Optical: Rolf Olsen; Infrared: NASA/JPL-Caltech

Dwarf galaxies feel the blast from larger neighbours

Dwarf galaxies are the most abundant galaxies in the universe yet little is known about how they behave, and the impact of larger neighbours.
A colour image of G63349, one of the galaxies in the survey, created using near-infrared (VISTA telescope) and optical (Sloan telescope) data collated by the GAMA survey. (The bright green object is a nearby star.) ICRAR/GAMA

Don’t panic, but the universe is slowly dying

Our universe's most exciting days are well behind us, with new research showing the universe is now slowly but surely dying.
Breaking down the colours in the star light can reveal more about what you are looking at. Flickr/Indigo Skies Photography

Explainer: seeing the universe through spectroscopic eyes

Astronomers can tell a whole lot more about a star or a galaxy if they break up the visible light in a rainbow of colours.

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