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Theoretical prediction of the image of the black hole from the table-top experiment. The radius of the ring depends on the temperature. The image of the black hole is deformed as the observation point θobs is varied. Credit: Osaka University

New holographic method to simulate black holes with tabletop experiment

Science
The holographic image of a simulated black hole, if observed by this tabletop experiment, may serve as an entrance to the world of quantum gravity.
These galaxies are selected from a Hubble Space Telescope program to measure the expansion rate of the universe, called the Hubble constant. The value is calculated by comparing the galaxies' distances to the apparent rate of recession away from Earth (due to the relativistic effects of expanding space). By comparing the apparent brightnesses of the galaxies' red giant stars with nearby red giants, whose distances were measured with other methods, astronomers are able to determine how far away each of the host galaxies are. This is possible because red giants are reliable milepost markers because they all reach the same peak brightness in their late evolution. And, this can be used as a "standard candle" to calculate distance. Hubble's exquisite sharpness and sensitivity allowed for red giants to be found in the stellar halos of the host galaxies. The red giants were searched for in the halos of the galaxies. The center row shows Hubble's full field of view. The bottom row zooms even tighter into the Hubble fields. The red giants are identified by yellow circles. Credit: NASA, ESA, W. Freedman (University of Chicago), ESO, and the Digitized Sky Survey

New Hubble constant measurement adds to mystery of universe’s expansion rate

Space
In a new study, scientists announced a new measurement of the Hubble constant using a kind of star known as a red giant and indicated that the expansion rate for the nearby universe is just under 70 kilometers per second per megaparsec (km/sec/Mpc).
Some supermassive black holes didn’t emerge from star remnant

Some supermassive black holes didn’t emerge from star remnant

Space
Some black holes such as stellar black holes are believed to form when the center of a very massive star collapses in upon itself....

Data visualization can reveal the nature of the universe

Space
In applying scientific standards used to make models for understanding cell biology and physics to the difficulties of cosmology and big data, Cornell scientists...
This is an artist's concept depicting the presence of buckyballs in space. Buckyballs, which consist of 60 carbon atoms arranged like soccer balls, have been detected in space before by scientists using NASA's Spitzer Space Telescope. The new result is the first time an electrically charged (ionized) version has been found in the interstellar medium. Credits: NASA/JPL-Caltech

Tiny electric soccer balls detected in space could solve an interstellar mystery

Space
Using NASA's Hubble space telescope, scientists have detected the existence of electrically-charged molecules in space shaped like soccer balls, highlights the mysterious contents of...
An artist's impression of a Gamma Ray Burst jet over time, and the small patches of magnetic fields present, as revealed by new research. Credit Dr Kitty Yeung.

Astronomers make first detection of polarised radio waves in Gamma Ray Burst jets

Space
Using Good fortune and cutting-edge scientific instruments, scientists observed a Gamma Ray Burst jet and detected the polarisation of radio waves within it for...
A galaxy with a quasar at its center, surrounded by dust. (Illustration: Michelle Vigeant)

Cold quasars could rewrite our understanding of a galaxy’s lifecycle

Space
A Cold quasar is a galaxy with a quasar at the center and abundant cold gas that can still produce new stars. Gas falling...
This artist's illustration shows what one of the very first galaxies in the Universe might have looked like. High levels of violent star formation and star death would have illuminated the gas filling the space between stars, making the galaxy largely opaque and without a clear structure. CREDIT James Josephides (Swinburne Astronomy Productions)

Universe’s earliest galaxies were brighter than expected

Space
Using NASA's Spitzer Telescope, astronomers have recently found cues on how galaxies lit up the universe. According to their findings, some of the Universe's...
Astronomers developed a mosaic of the distant Universe, called the Hubble Legacy Field, that documents 16 years of observations from the NASA/ESA Hubble Space Telescope. The image contains 200,000 galaxies that stretch back through 13.3 billion years of time to just 500 million years after the Big Bang. The new set of Hubble images, created from nearly 7,500 individual exposures, is the first in a series of Hubble Legacy Field images. The image comprises the collective work of 31 Hubble programs by different teams of astronomers. Hubble has spent more time on this small area than on any other region of the sky, totaling more than 250 days, representing nearly three-quarters of a year. The team is working on a second set of images, totaling more than 5,200 Hubble exposures, in another area of the sky.

2,65,000 galaxies in an extensive legacy field mosaic

Space
NASA's Hubble Space Telescope has recently captured an image of a legacy field, showing 2,65,000 galaxies, each at different stages in their life cycles,...
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