24 Canon lenses strapped together with the power of a refracting telescope 1.8 meters in diameter.
An international team of researchers has bundled groups of 24 Canon EF 400mm f/2.8 lenses together into what they call the Dragonfly Telephoto Array in order to capture photos of distant stars.
The Dragonfly Telephoto Array is a telescope that is equipped with multiple Canon 400mm f/2.8L IS II USM lenses. The telescope array was designed in 2013 by the team, also named Project Dragonfly, which is an international research team from Yale University and the University of Toronto. The Dragonfly Telephoto Array is capable of capturing images of galaxies that are so faint and large that they had escaped detection by even the largest conventional telescopes. Its mission is to study the low surface brightness universe to elucidate the nature of dark matter and to utilize the concept of distributed telescopes.
“The Dragonfly Telephoto Array is the pre-eminent survey telescope for finding faint, diffuse objects in the night sky,” the reseachers explain. “It has enabled us to discover ultra-diffuse galaxies and other low-surface brightness phenomena—rendering images that deepen our understanding of how galaxies are formed and providing key insights into the nature of dark matter.”
Physicists are interested in the big questions like “Where did we come from?” and “What is all this stuff?”. But the answers to some of these questions, just lead to more questions.
Hosted by: Michael Aranda.
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Background videos: Fundamental forces: https://youtu.be/669QUJrF4u0 Electroweak theory: https://youtu.be/u05VK0pSc7I Is Big Bang hidden in gravity waves: https://youtu.be/VXr1mzY2GnY Cosmic Microwave background: https://youtu.be/XcXCrFIivyk.
Errata: 12:26 — Helium-3 has 2 protons and 1 Neutron.
Chapters: 0:00 — How many atoms are there? 1:01 — We don’t know what happened at or before t=0 3:34 — Cosmic inflation. 5:27 — What we do know. 8:29 — How protons and neutrons formed. 10:41 — How charged nucleons formed. 13:47 — How neutral atoms formed. 15:24 — How to learn more about atoms.
Summary: Where did the first atom come from? The short answer is the big bang. In the early universe there was an immense amount of energy, The energy condensed, atoms formed. But there’s a lot more that happened, which will be explained here.
The big bang is often thought of as the theory explaining the beginning. but it’s not. We don’t know when the universe actually started, or whether it did. Our best theory of the early universe is the standard model of cosmology, We can only go back to one Planck time, about 10^−43 seconds. This is the smallest unit of time that can theoretically exist according to quantum mechanics. We don’t know what came before this.
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Chapters. 0:00 — You are a time traveler. 2:32 — Spacetime & light cone review. 6:15 — Flat Spacetime equations. 7:03 — Schwarzschild radius, metric. 8:42 — Light cone near a black hole. 10:15 — How to escape black hole. 10:39 — Kerr-Newman metric. 11:34 — How to remove the event horizon. 11:50 — What is a naked singularity. 12:20 — How to travel back in time. 13:26 — Problems.
Summary. Time travel is nothing special. You’re time traveling right now into the future. Relativity theory shows higher gravity and higher speed can slow time down enough to allow you to potentially travel far into the future. But can you travel back in time to the past?
In this video I first do a quick review of light cones, world lines, events, light like curves, time-like curves, and space-like curves in this video so that you can understand the rest of the video.
A space like-world line means that the object has to travel faster than light. But moving anything to the speed of light requires an infinite amount of energy to accelerate. So this is not possible.
Going faster than the speed of light can create scenarios that allow you to travel back in time. But since this is not physically possible, we need to figure out a clever manipulation of space time. This means we have to solve Einstein’s equations of General relativity.
When we look into the night sky, we see the universe as it once was. We know that in the past, the universe was once warmer and denser than it is now. When we look deep enough into the sky, we see the microwave remnant of the big bang known as the cosmic microwave background. That marks the limit of what we can see. It marks the extent of the observable universe from our vantage point.
The cosmic background we observe comes from a time when the universe was already about 380,000 years old. We can’t directly observe what happened before that. Much of the earlier period is fairly well understood given what we know about physics, but the earliest moments of the big bang remain a bit of a mystery. According to the standard model, the earliest moments of the universe were so hot and dense that even the fundamental forces of the universe acted differently than they do now. To better understand the big bang, we need to better understand these forces.
One of the more difficult forces to understand is the weak force. Unlike more familiar forces such as gravity and electromagnetism, the weak is mostly seen through its effect of radioactive decay. So we can study the weak force by measuring the rate at which things decay. But there’s a problem when it comes to neutrons.
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Researched and Written by JD Voyek. Narrated and Edited by David Kelly. Thumbnail Art by Ettore Mazza.
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From Stargate to Interstellar, wormholes are our favorite method for traveling across fictional universes. But they are also a very serious field of study for some of our greatest minds over the last century. So what’s the holdup? When do we get to wormhole ourselves out of here?
Hosted by Matt O’Dowd. Written by Matt O’Dowd. Graphics by Leonardo Scholzer, Yago Ballarini, & Pedro Osinski. Directed by: Andrew Kornhaber. Camera Operator: Bahaar Gholipour. Executive Producers: Eric Brown & Andrew Kornhaber.
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Find out how scientists are mapping the black holes throughout the Milky Way and beyond as well as the answer to the Escape the Kugelblitz Challenge Question. Were you able to save humanity?
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Quasars, X-ray Binaries and Supermassive voids at the center of our galaxies … black holes take many forms. In this episode Matt tells us what these different types of black holes are and how scientists are using VLBI, Very Long Baseline Interferometry, to map the different black holes throughout the known universe.
Resolving Microlensing Events with Triggered VLBI Karami, Broderick, Rahvar, and Reid, 2016, The Astrophysical Journal, 833169 http://phys.org/news/2016-12-black-holes-years-method.html. https://arxiv.org/abs/1601.
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The Kepler telescope recently noticed a strange partial eclipse that some have speculated could be a Dyson Sphere. Are Dyson Sphere’s possible? Are they practical? What other alternatives to futuristic energy capture do we have to choose from? Why not a kugelblitz — a swarm of black hole powered engines?
Speaking at the 6th International FQXi Conference, “Mind Matters: Intelligence and Agency in the Physical World.”
The Foundational Questions Institute (FQXi) catalyzes, supports, and disseminates research on questions at the foundations of physics and cosmology, particularly new frontiers and innovative ideas integral to a deep understanding of reality but unlikely to be supported by conventional funding sources.
