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Posts Tagged "quasars"

Basic Space

How a new map of the early universe is like a hedgehog

On the back of a hedgehog...

A new method for investigating dark energy has allowed astronomers to peer further back into the past than ever before, revealing a universe that was very different to the one we live in today. Today’s universe is expanding. Not just that, its expansion is accelerating. Galaxies are not only getting further away from us all [...]

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Life, Unbounded

Black Hole Roundup

Spinning black hole (NASA)

Black holes, black holes, and more black holes. In the past few weeks I’ve been thinking, talking, and even dreaming about black holes (yes really, somnolent thoughts seem well suited to these fantastic objects). Mostly this has been an effect of my book Gravity’s Engines hitting the shelves, but it’s also because barely a day [...]

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Observations

Quasars at 50: Luminous Cosmic Beacons Remain a Puzzle

Quasar 3C 273 with jet

Fifty years ago, in the journal Nature, astronomer Maarten Schmidt published a brief paper noting that a star-like object known as 3C 273 was simply too far away to be a star in the Milky Way. Schmidt, of the California Institute of Technology, concluded on the basis of spectroscopic observations that the object was most [...]

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