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Kavli Institute for Cosmology, Cambridge

 

When was cosmic dawn? Some of the most distant galaxies known hold a clue

Wed, 30/06/2021 - 13:34

Nature, Published online: 29 June 2021; doi:10.1038/d41586-021-01766-6

Light from the early days of the Universe helps to pin-point when the stars switched on after the Big Bang.

NASA’s Webb Will Use Quasars to Unlock the Secrets of the Early Universe

Thu, 24/06/2021 - 08:54
Portal origin URL: NASA’s Webb Will Use Quasars to Unlock the Secrets of the Early UniversePortal origin nid: 471877Published: Wednesday, June 23, 2021 - 09:50Featured (stick to top of list): noPortal text teaser: Shortly after its launch later this year, a team of scientists will train NASA’s James Webb Space Telescope on six of the most distant and luminous quasars. They will study the properties of these quasars and their host galaxies, and how they are interconnected during the first stages of galaxy evolution in the very early universe.Portal image: This is an artist's concept of a galaxy with a brilliant quasar at its center.

Sounding out the Universe

Fri, 18/06/2021 - 08:33

Mystery of Galaxy's Missing Dark Matter Deepens

Fri, 18/06/2021 - 08:28
Portal origin URL: Mystery of Galaxy's Missing Dark Matter DeepensPortal origin nid: 471822Published: Thursday, June 17, 2021 - 11:00Featured (stick to top of list): noPortal text teaser: When astronomers using NASA's Hubble Space Telescope uncovered an oddball galaxy that looked like it didn't have much dark matter, some thought the finding was hard to believe and looked for a simpler explanation.Portal image: This Hubble Space Telescope snapshot reveals an unusual "see-through" galaxy. The giant cosmic cotton ball is so diffuse and its ancient stars so spread out that distant galaxies in the background can be seen through it.

Spiral features in the early Universe

Fri, 11/06/2021 - 08:29

The first 5 years of gravitational-wave astrophysics

Fri, 04/06/2021 - 07:29

Gravitational waves are ripples in spacetime generated by the acceleration of astrophysical objects; a direct consequence of general relativity, they were first directly observed in 2015. Here, I review the first 5 years of gravitational-wave detections. More than 50 gravitational-wave events have been found, emitted by pairs of merging compact objects such as neutron stars and black holes. These signals yield insights into the formation of compact objects and their progenitor stars, enable stringent tests of general relativity, and constrain the behavior of matter at densities higher than that of an atomic nucleus. Mergers that emit both gravitational and electromagnetic waves probe the formation of short gamma-ray bursts and the nucleosynthesis of heavy elements, and they measure the local expansion rate of the Universe.

The most detailed 3D map of the Universe ever made

Tue, 01/06/2021 - 07:50

Nature, Published online: 28 May 2021; doi:10.1038/d41586-021-01466-1

Cosmologists have unveiled a trove of fresh data, but the measurements do not settle earlier questions about the Universe's unexpected smoothness.

New dark matter map reveals cosmic mystery

Fri, 28/05/2021 - 11:07

The most detailed map of dark matter in the Universe is puzzling physicists.

A physicist goes in search of our origins

Tue, 25/05/2021 - 08:38

Nature, Published online: 24 May 2021; doi:10.1038/d41586-021-01398-w

CERN experimentalist offers sweeping history of the Universe, in science and culture.

A new generation takes on the cosmological constant

Tue, 18/05/2021 - 08:36

The long-standing problem of the cosmological constant, described both as “the worst prediction in the history of physics” and by Einstein as his “biggest blunder”, is being tackled with renewed vigour by today’s cosmologists. Rob Lea investigates

Pulsars hint at cosmic gravitational-wave background

Thu, 06/05/2021 - 08:48

The observation of tiny deviations in the arrival times of radio pulses from neutron stars could be our first glimpse at gravitational waves from merging supermassive black holes.