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How hot or not is a Black Hole?

How hot (or cold) is a Black Hole?
Judy, Llandrillo

Short Answer – the temperature of a black hole is inversely proportional to its mass. For a black hole with the same mass as our Sun, the temperature is 60 billionths of a degree kelvin.

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Why does Iapetus have two colours?

Why does Iapetus have two colours?
Chris, South Africa

Iapetus is the third largest satellite of Saturn, and it is the largest object in the solar system not in…

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What makes the worlds seem round?

Are Mimas and Miranda the smallest known objects in hydrostatic equilibrium?
Dan – London

This question relates to the shape of astrophysical objects and as we discussed in the past, it’s an important characteristic of…

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"From One to Ten, How Do You Rate?"

Of all the things a person can be asked, this is surely the most vague. First of all, why it is only one to ten? Secondly, what sort of “rating” are we talking about? 640 more words

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How do we know how massive stars are?

How do we know how massive stars are? 

Mitch, London

As we discussed in the previous vlog our understanding of stars is still incomplete, but there are areas which we are very confident on what we know. 

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I'm the Universe, hear me roar.

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. 248 more words


How about that... Gamma Ray Pale Ale


Friday lunches in the pub are the best – especially when you discover your new favourite beer. I had ventured off to Warren Street to check out a new pub; one of those intriguing pubs that has people crowding round the outside daily yet you’ve never manged to have time to stop. 170 more words

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