Physics, Walter Lewin, educational videos, astronomy.

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Physics

Walter Hendrik Gustav Lewin (born January 29, 1936) is a Dutch astrophysicist and former professor of physics at the Massachusetts Institute of Technology. Lewin earned his doctorate in nuclear physics in 1965 at the Delft University of Technology and was a member of MIT's physics faculty for 43 years beginning in 1966 until his retirement in 2009. Lewin's contributions in astrophysics include the first discovery of a rotating neutron star through all-sky balloon surveys and research in X-ray detection in investigations through satellites and observatories. Lewin has received awards for teaching and is known for his lectures on physics and their publication online via YouTube, edX and MIT OpenCourseWare.

NASA image gallery

Audiobook

"A brief history of time"

by Stephen Hawking.

Audiobook

"The universe in a nutshell"

by Stephen Hawking.

See the Pen Fluid Simulation by Jeff Thomas ( @aecend ) on CodePen.

Estimates of the reproduction ratio from epidemic surveillance may be biased in spatially structured populations

Nature Physics, Published online: 25 April 2024; doi:10.1038/s41567-024-02471-7Spatial dynamics can obscure epidemic trends from surveillance data, biasing reproduction ratio estimates over long periods. A spectral correction reweights incidence data to remove this bias, thus improving monitoring to inform response strategies.

Spin Berry curvature-enhanced orbital Zeeman effect in a kagome metal

Nature Physics, Published online: 22 April 2024; doi:10.1038/s41567-024-02487-zControlling orbital magnetic moments for applications can be difficult. Now local probes of a kagome material, TbV6Sn6, demonstrate how the spin Berry curvature can produce a large orbital Zeeman effect that can be tuned with a magnetic field.

Room-temperature flexible manipulation of the quantum-metric structure in a topological chiral antiferromagnet

Nature Physics, Published online: 22 April 2024; doi:10.1038/s41567-024-02476-2Manipulation of the quantum-metric structure to produce topological phenomena has rarely been studied. Now, flexible control of the quantum-metric structure is demonstrated in a topological chiral antiferromagnet at room temperature.

Irreversible entropy transport enhanced by fermionic superfluidity

Philipp Fabritius

Nature Physics, Published online: 22 April 2024; doi:10.1038/s41567-024-02483-3Connecting two superfluid reservoirs leads to both particle and entropy flow between the systems. Now, a direct measurement of the entropy current and production in ultracold quantum gases reveals how superfluidity enhances entropy transport.

Penning-trap measurement of the Q value of electron capture in ¹⁶³ Ho for the determination of the electron neutrino mass

Christoph Schweiger

Nature Physics, Published online: 19 April 2024; doi:10.1038/s41567-024-02461-9Electron capture in 163Ho can be used to determine the electron neutrino mass. The Q value of this process is crucial for the evaluation of the systematic uncertainty in such a measurement, and a 50-fold improvement is now reported.

Quantum sensing at the megabar frontier

Leonardo Benini

Nature Physics, Published online: 16 April 2024; doi:10.1038/s41567-024-02485-1Quantum sensing at the megabar frontier

Naturally superconducting

Nature Physics, Published online: 16 April 2024; doi:10.1038/s41567-024-02484-2Naturally superconducting

Slightly out of tune

Nature Physics, Published online: 16 April 2024; doi:10.1038/s41567-024-02470-8Bart Verberck uses the musical cent as a pretext to touch on some of the intricacies of musical tuning systems.

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NASA to Provide Coverage as Dragon Departs Station with Science

Abbey A. Donaldson

NASA and its international partners are set to receive scientific research samples and hardware as a SpaceX Dragon cargo spacecraft departs the International Space Station on Sunday, April 28 weather permitting. The agency will provide coverage of undocking and departure beginning at 12:45 p.m. EDT on NASA+, NASA Television, the NASA app, YouTube, and the […]

Site-Wide Environmental Assessment for Marshall Space Flight Center, Alabama

The National Aeronautics and Space Administration (NASA) has prepared a Draft Environmental Assessment (EA) that analyzes the environmental impacts of implementing continuing and future mission support activities at the Marshall Space Flight Center (MSFC) in Huntsville, Alabama. The EA evaluated the potential environmental effects associated with air quality; climate change and greenhouse gases; land use; […]

NASA-Led Study Provides New Global Accounting of Earth’s Rivers

Anthony Greicius

The novel approach to estimating river water storage and discharge also identifies regions marked by ‘fingerprints’ of intense water use. A study led by NASA researchers provides new estimates of how much water courses through Earth’s rivers, the rates at which it’s flowing into the ocean, and how much both of those figures have fluctuated […]

Hubble Spots a Magnificent Barred Galaxy

The magnificent central bar of NGC 2217 (also known as AM 0619-271) shines bright in the constellation of Canis Major (The Greater Dog), in this image taken by the NASA/ESA Hubble Space Telescope. Roughly 65 million light-years from Earth, this barred spiral galaxy is a similar size to our Milky Way at 100,000 light-years across. Many stars are concentrated in its […]

Identification of Noise Sources During Launch Using Phased Array Microphone Systems

Meagan Chappell

Identification of Noise Sources During Launch Using Phased Array Microphone Systems Every part of a launch vehicle, launch pad, and ground operation equipment is subjected to the high acoustic load generated during lift-off [1]. Therefore, many extreme measures are taken to try to suppress this acoustic environment by damping with a water deluge system and […]

NASA Grant Brings Students at Underserved Institutions to the Stars

Anthony Greicius

At the agency’s Jet Propulsion Laboratory, interns from Cal State LA are learning key skills studying the origins of life. What does wastewater management in Los Angeles have to do with the search for life on Mars? Eduardo Martinez certainly didn’t make the connection when he was pursuing a master’s in civil engineering. Not at […]

Trajectory Reverse Engineering

Meagan Chappell

A strategy for transferring spacecraft trajectories between flight mechanics tools, called Trajectory Reverse Engineering (TRE), has been developed[1]. This innovative technique has been designed to be generic, enabling its application between any pair of tools, and to be resilient to the differences found in the dynamical and numerical models unique to each tool. The TRE […]

NASA’s Hubble Pauses Science Due to Gyro Issue

NASA is working to resume science operations of the agency’s Hubble Space Telescope after it entered safe mode April 23 due to an ongoing gyroscope (gyro) issue. Hubble’s instruments are stable, and the telescope is in good health. The telescope automatically entered safe mode when one of its three gyroscopes gave faulty readings. The gyros […]

NASA’s Commercial Partners Deliver Cargo, Crew for Station Science

NASA partners with commercial companies to provide safe, reliable, and cost-effective transportation of cargo and crew members to and from the International Space Station. A platform for long-duration research in microgravity, the station has operated continuously for more than 23 years, its crew members conducting a broad range of technology demonstrations and thousands of experiments […]

NASA’s ORCA, AirHARP Projects Paved Way for PACE to Reach Space

It took the Plankton, Aerosol, Cloud, ocean Ecosystem (PACE) mission just 13 minutes to reach low-Earth orbit from Cape Canaveral Space Force Station in February 2024. It took a network of scientists at NASA and research institutions around the world more than 20 years to carefully craft and test the novel instruments that allow PACE […]

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