Re: Pondering Big Cosmology Questions Through Lectures and Dialogues
Posted: Mon Aug 12, 2019 10:16 am
by Eli
A Journey to the End of the Universe
"Could humans ever travel to other galaxies within their lifetime? The immense scale of the Universe seems to prohibit such voyages, after all the nearest galaxy is so far away that it takes light itself - the fastest thing in the Universe - 2.5 million years to complete the trip. Remarkably, there is a trick that might allow humans to accomplish this feat"
Re: Pondering Big Cosmology Questions Through Lectures and Dialogues
Posted: Thu Aug 15, 2019 5:53 pm
by Eli
The Distance Ladders of the Universe, from Cepheids, to Type Ia Supernovae to the redshifted 21 cm signal.
Re: Pondering Big Cosmology Questions Through Lectures and Dialogues
Einstein’s General Relativity passes the test at the centre of our Galaxy
Measurements of a star passing close to the supermassive black hole at the centre of the Milky Way confirms the predictions of Einstein’s theory of General Relativity in a high gravity environment.
Re: Pondering Big Cosmology Questions Through Lectures and Dialogues
Posted: Fri Aug 16, 2019 10:54 pm
by Eli
As the Earth orbits the Sun, a nearby star will appear to move against the more distant background stars. Astronomers can measure a star's position once, and then again 6 months later and calculate the apparent change in position. The star's apparent motion is called stellar parallax.
Re: Pondering Big Cosmology Questions Through Lectures and Dialogues
Posted: Thu Sep 26, 2019 1:03 pm
by Eli
What's it like to discover a galaxy -- and have it named after you? Astrophysicist and TED Fellow Burçin Mutlu-Pakdil lets us know in this quick talk about her team's surprising discovery of a mysterious new galaxy type.
Dr. Burçin Mutlu-Pakdil is searching for the most peculiar objects in the Universe. Her research has led to a discovery of an extremely rare galaxy with a unique circular structure, which is now commonly referred to as Burçin's Galaxy. Her work has provided the first description of a double-ringed elliptical galaxy, challenging current theories and assumptions about how the universe works and how galaxies start and evolve.
Re: Pondering Big Cosmology Questions Through Lectures and Dialogues
Posted: Fri Sep 27, 2019 11:42 pm
by Eli
A gigantic black hole rips apart a star - seen for the first time.
The star, which was about the same size as our sun, was seen from 375 million light years away warping and spiraling into the gravitational pull of a supermassive black hole ... in a tidal disruption event.
The Transiting Exoplanet Survey Satellite (TESS)- captured the detailed timeline from beginning to end for the first time
Re: Pondering Big Cosmology Questions Through Lectures and Dialogues
Posted: Fri May 29, 2020 10:21 am
by Eli
"At the heart of the Milky Way, there's a supermassive black hole that feeds off a spinning disk of hot gas, sucking up anything that ventures too close -- even light. We can't see it, but its event horizon casts a shadow, and an image of that shadow could help answer some important questions about the universe. Scientists used to think that making such an image would require a telescope the size of Earth -- until Katie Bouman and a team of astronomers came up with a clever alternative. Bouman explains how we can take a picture of the ultimate dark using the Event Horizon Telescope." - TED.
