91色情片

Medium shot of a young female astronaut sleeping in a glass pod in a space station; Shutterstock ID 1526690303; purchase_order: -; job: -; client: -; other: -

If humans needed to hibernate, how would civilisation have developed?

Our readers speculate about the differences a long winter nap would have made to our lives - both beneficial and less so

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?

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

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

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This week鈥檚 new questions

Spaceman walks on the red planet Mars. Space Mission. Astronaut travel in space; Shutterstock ID 532139260; purchase_order: -; job: -; client: -; other: -

Should we be thinking about genetic modifications for humans on Mars?

H3NTB2 Woman by giant trees in snow-covered forest, Sequoia National Park, California, USA

Why don鈥檛 trees rot in the ground, while wooden structures do?

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This week鈥檚 new questions

Does life require Earth鈥檚 rate of rotation to lie in a certain range? Plus, what are those limits and what changes to life鈥檚 existence would there be as they are approached? Also, when a spirit or bubble level lies flat, what does that mean relative to Earth?

Are there good viruses? What would happen if all viruses disappeared?

Why do our nostrils point down, not straight out from our faces?

This week鈥檚 new questions

How and why did grammatically complex languages such as Latin develop?