I’m the Universe, hear me roar.

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The cosmos has plenty of terrifying Lovecraftian features, but one of my favourites is the Space Roar. There is a loud radio signal, described as a constant hiss, that seems to pervade the cosmos. It is louder than the radio signature of radio galaxies, and it is without explanation.

Shopping for rings

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I have a space question. I know about the Roche limit but is there an upper limit to how big a ring can get compared to its planet? Asked by Dan Of course there are limits, the Universe is all about limits! But they're not as strict as one would think. We have found an object in 2012, J1407b, with a ring system 200 million kilometres in diameter. If the rings were centred on Earth they would cover the inner solar system all the way to the orbit of Mercury on the opposite side of the Sun.

Destroying the One Ring in Space

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I was asked by Larry, one of my students, about what would be the best place in the solar system to destroy the One Ring. Since the 25th of March is the anniversary of its destruction and the fall of Sauron I thought I’d dedicate this vlog to answering the question as seriously and as accurately as possible.

Time management.

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"Can you build me a hyperbolic time chamber? I'll buy you a coke." Friend of mine while we were walking down the street. Almost 110 years ago our view of time...

Can a satellite hover over the Sun?

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My friend Russell asked me under which condition an object would be able to stand still around the Sun. This is a very interesting question; it probes some fundamental...

The most dangerous club in the Universe

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What would a planet orbiting a pulsar look like from the ground? Would it look like a giant disco planet with a constant strobe light? Pulsar form from supernova explosions,...

Colliding stars

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I know that likelihood of stars colliding is very low, but have there been papers describing the theoretical process of star collision? James, London I think we can divide star-collision into...

All about the Asteroid Belt

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What does it actually look like in the asteroid belt? Is it anything like as dense as is shown in films? Or is it more like you can see...

How big is the biggest galaxy in the Universe?

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If by big we mean physical dimension, the largest known galaxy is most likely IC1101. IC1101 is gargantuan even among galaxies; it's a super elliptical galaxy with a diffuse...

What’s the speed of Gravity?

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For all intents and purposes gravity travels at the speed of light but it is very hard to measure, and so far we have no direct model-independent measurement of the...