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James Webb Confirms Hubble’s Calculation of Hubble’s Constant

17-11-2024 17:02 via universetoday.com

We have been spoiled over recent years with first the Hubble Space Telescope (HST) and then the James Webb Space Telescope (JWST.) Both have opened our eyes on the Universe and made amazing discoveries. One subject that has received attention from both is the derivation of the Hubble Constant – a constant relating the velocity of remote galaxies and their distances. A recent paper announces that JWST has just validated the results of previous studies by the Hubble Space Telescope to accura

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What Should Light Sails Be Made Out Of?

17-11-2024 16:15 via universetoday.com

The Breakthrough Starshot program aims to cross the immense distances to the nearest star in just decades. Using a high-powered laser to propel a reflective sail technology to relativistic speeds is their mission. The selection of sail material is key to its success as it must be lightweight while being able to withstand acceleration and radiation from the laser. A recent study explores various materials and proposes that core-shell structures—spherical particles composed of two different

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Twee sterrenstelsels ontdekt die zo zijn uitgelijnd dat hun zwaartekracht als een samengestelde lens werkt

17-11-2024 15:56 via astroblogs.nl

Een internationaal team van sterrenkundigen heeft twee sterrenstelsels ontdekt die zo zijn uitgelijnd dat hun zwaartekracht als een samengestelde lens werkt. Dat de massa van sterrenstelsels licht van erachter liggende sterrenstelsels kan verbuigen is al lang bekend – Einstein voorspelde het al op basis van zijn Algemene Relativiteitstheorie en in de praktijk worden ‘zwaartekrachtlenzen’ zoals […]

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A Giant Meteorite Impact 3.26 Billion Years Ago Helped Push Life Forward

17-11-2024 15:36 via universetoday.com

The Earth has always been bombarded with rocks from space. It’s true to say though that there were more rocks flying around the Solar System during earlier periods of its history. A team of researchers have been studying a meteorite impact from 3.26 billion years ago. They have calculated this rock was 200 times bigger than the one that wiped out the dinosaurs. The event would have triggered tsunamis mixing up the oceans and flushing debris from the land. The newly available organic materi

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Kosmisch kleurenspel: de betovering van NGC 1333

17-11-2024 13:13 via scientias.nl

Om zijn 33-jarige verjaardag te vieren, legde de Hubble-telescoop een adembenemend beeld vast van stervormingsregio NGC 1333, vol levendige kleuren en details. Hoewel de foto al in 2023 werd gepubliceerd, brengen we hem opnieuw onder de aandacht vanwege zijn indrukwekkende kijk op het geboorteproces van sterren. Op 20 april 2023 vierde de NASA/ESA Hubble-ruimtetelescoop zijn […]
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America’s Particle Physics Plan Spans the Globe — and the Cosmos

17-11-2024 04:15 via universetoday.com

RALEIGH, N.C. —Particle physicist Hitoshi Murayama admits that he used to worry about being known as the “most hated man” in his field of science. But the good news is that now he can joke about it.Last year, the Berkeley professor chaired the Particle Physics Project Prioritization Panel, or P5, which drew up a list of multimillion-dollar physics experiments that should move ahead over the next 10 years. The list focused on phenomena ranging from subatomic smash-ups to cosmic

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Millions of Phones Could Map the Earth’s Ionosphere

17-11-2024 03:04 via universetoday.com

We are all familiar with the atmosphere of the Earth and part of this, the ionosphere, is a layer of weakly ionized plasma. It extends from 50 to 1,500 km above the planet. It’s a diffuse layer but sufficient to interfere with satellite communications and navigation systems too. A team of researchers have come up with an intriguing idea to utilise millions of mobile phones to help map the ionosphere by relying on their GPS antennas.The ionosphere is a layer of the Earth’s atmosphere

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