1. New Scientist:
Some 13.8 billion years ago, the universe began in a big bang – or, at least, that is what we think happened. Astrophysicist Jo Dunkley is at the forefront of efforts to work out exactly what took place in the immediate aftermath of that moment of cosmic creation. And a new telescope might just help her answer this question once and for all.
The issue with the big bang is that we can’t see it directly. The best we can do is look at the cosmic microwave background (CMB), often called the afterglow of the big bang. Faintly daubed across the whole sky, this radiation is all that is left of the first light that could travel in the universe. Subtle patterns in this light fit with the well-established idea that the big bang was followed by a period known as inflation, when the universe expanded at a rip-roaring pace. But it has never been proven.
Dunkley, who is based at Princeton University, thinks that observing the CMB in finer detail than ever before will clinch the deal, specifically by helping us see patterns imprinted by gravitational waves from the dawn of time. To glimpse these, she plans to use the Simons Observatory, a purpose-built telescope in Chile that is on the cusp of switching on. (Sources: jodunkley.com, newscientist.com)
2. North Korea this month lifted the veil on one of its most closely guarded nuclear secrets, releasing the first public photos of centrifuges it uses to make bomb-grade uranium. The revelatory images of North Korean leader Kim Jong Un touring a vast centrifuge hall, along with the recent startup of a reactor that may be producing plutonium and tritium for atomic weapons, heighten concerns over the rogue nation’s growing arsenal. They also help bring its nuclear program into sharper focus. Kim’s nuclear whistle stop, which also included images of a smaller centrifuge hall, follows a speech in which he reiterated a 2023 vow to “exponentially” increase his nuclear stockpile. He has suggested the effort will include large numbers of tactical nuclear weapons, lower yield devices designed for short- or medium-range missiles. “North Korea is deadly serious about deploying large numbers of tactical nuclear weapons,” says Jeffrey Lewis, a North Korea expert at the James Martin Center for Nonproliferation Studies. (Source: science.org)
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