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So a neutron star is kind of.
About the size of Chicago.
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Hello and welcome to NewsHour from the BBC World Service.
Coming to you live from London.
With me, Shawn Lay.
In a moment, our main story this hour, the lightning advance of Syrian opposition forces on the country's cities.
Could the Assad dynasty, which has controlled Syria for more than half a century, be approaching its end?
And in half an hour, we'll also hear from South Korea.
Thousands have gathered outside the national assembly demanding the removal of the country's president.
But before all that, in Syria, suppression of dissent, a tool the Assads have used so effectively before, was the catalyst for the country's civil war.
That civil war erupted in 2011 when the government brutally suppressed pro democracy demonstrations.
Now, in recent days, first Aleppo, then Hama, have fallen, cities back in the control of Syrian rebels.
They are now outside the city of Homs, in the country's center.
If that surrenders to them, Could Damascus, the capital, be next?
And if so, how soon?
For years, an apparently ever evolving kaleidoscope of rebel groups, some jihadist, some nationalist, others secular, even liberal, exercised power at different places at different times.
Yet the government has essentially remained in control of much of Syria, and its writ has run to most of the country's cities.
It's been sustained, too, by the attitude of regional powers.