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2T2B4HK One man walking by a close up of a pair of eyes from a portrait painted by Antonello de Messina on a poster in central London

Could two three-dimensional images create a four-dimensional one?

Yes, says one reader, who goes on to speculate about what else might be possible

2DAC6P0 Sculpture 'Medics to the World' honouring the health care workers battling Covid-19

There are good and bad bacteria, but are there good viruses? Part 2

The events surrounding the Big Bang were so cataclysmic that they left an indelible imprint on the fabric of the cosmos. We can detect these scars today by observing the oldest light in the Universe. As it was created nearly 14 billion years ago, this light ???????? which exists now as weak microwave radiation and is thus named the cosmic microwave background (CMB) ???????? has now expanded to permeate the entire cosmos, filling it with detectable photons. The CMB can be used to probe the cosmos via something known as the Sunyaev-Zel????????dovich (SZ) effect, which was first observed over 30 years ago. We detect the CMB here on Earth when its constituent microwave photons travel to us through space. On their journey to us, they can pass through galaxy clusters that contain high-energy electrons. These electrons give the photons a tiny boost of energy. Detecting these boosted photons through our telescopes is challenging but important ???????? they can help astronomers to understand some of the fundamental properties of the Universe, such as the location and distribution of dense galaxy clusters. The NASA/ESA Hubble Space Telescope observed one of most massive known galaxy clusters, RX J1347.5????????1145, seen in this Picture of the Week, as part of the Cluster Lensing And Supernova survey with Hubble (CLASH). This observation of the cluster, 5 billion light-years from Earth, helped the Atacama Large Millimeter/submillimeter Array (ALMA) in Chile to study the cosmic microwave background using the thermal Sunyaev-Zel????????dovich effect. The observations made with ALMA are visible as the blue-purple hues. Links ESO Picture of the Week RX J1347.5????????1145 seen by Hubble only

This week鈥檚 new questions

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Virgin Money flusters chatbot, but just try living in Scunthorpe

Tom Gauld on a job for the most intelligent machine ever created

Twisteddoodles’ ideas for “research romance” books

A natural ice cave formed by glacial retreat, at the edge of a moraine.

Environment

Chilling images reveal melting ice worlds

Barcodes on Magazines

Mathematics

Barcodes: How they could be your latest mathematical party trick

Last Word

What is a smooth continuous curve with three axes of symmetry called?

Krakow, Poland - 4 May 2024: Large old antique medieval book written in Latin gothic font, colorful illuminations object closeup museum exhibit, Dominican monastery Old religious books concept; Shutterstock ID 2516551261; purchase_order: -; job: -; client: -; other: -

How and why did complex languages like Latin develop? Part 2

Our readers continue to grapple with this one, considering phonemes, inflections and sentence structure

This week鈥檚 new questions

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George R. R. Martin finally finishes鈥� a physics paper

Tom Gauld on the game of science

Twisteddoodles on tree communications