The discovery is announced of several currently unexplained radio sources, in circular patterns at estimated distances of around one billion light years. More information here, Unexpected Circular Radio Objects at High Galactic Latitude.
In this BBC video Ray Norris, lead author, speculates these may the shock waves from a "Humungous explosion" within a galaxy lying at the centre of the circles, but is at pains to emphasise that at this point we really don't know what they are.
Note: I'm not sure if this video will be visible outside of the UK.
In this BBC video Ray Norris, lead author, speculates these may the shock waves from a "Humungous explosion" within a galaxy lying at the centre of the circles, but is at pains to emphasise that at this point we really don't know what they are.
Note: I'm not sure if this video will be visible outside of the UK.
