A Nuclear Fusion Physicist and Astrophysicist.
BSc Physics & Engineering, MSc Nuclear Physics & Engineering, MSc Astrophysics, PhD Plasma Physics
Supernova (SN) Refsdal — Key Points Astronomers have been trying to understand space for thousands of years. Supernova Refsdal was the first known multiply-imaged supernova. Multiple images of the supernova are produced by strong gravitational lensing. Astronomers predicted the reappearance of the supernova before it was observed. The multiple images of the supernova exhibit measurable…
Big Bang: Key Points Hubble’s law (redshift of galaxies) and the Doppler effect provide direct evidence that the universe is expanding away from our reference point. Expansion has cooled the universe from the initial high temperatures at the Big Bang; radio astronomy detects signals from stars, galaxies, radio galaxies, quasars, and pulsars that trace this…
Introduction The universe was not perfectly uniform at the beginning; some regions had higher density than others. Over time these higher-density regions attracted most of the matter and began forming galaxies where matter concentration was greatest. The resulting large-scale structure—the “cosmic web”—connects observed galaxy clusters with a network of filaments. Figure 1 shows a model…
Overview Gravitational waves (GWs) are disturbances in spacetime produced by massive objects moving asymmetrically. Only the most massive and most relativistic systems produce GWs large enough to be detectable. The Laser Interferometer Gravitational-Wave Observatory (LIGO) and Virgo detectors use laser interferometry to detect tiny ripples in the fabric of spacetime; they have already detected dozens…
Uranus’ Peculiar Tilt Uranus spins on its side. It has an obliquity (tilt) of 98° — its rotation axis lies closer to the ecliptic plane than any other planet — and astronomers still debate how it got that peculiar tilt. Uranus Key Points Uranus has an obliquity (tilt) of 98° — its rotation axis is…
Black Hole Key Points Black holes (BHs) have a gravitational pull so strong that nothing, not even light, can escape. BHs can be divided into two main classes: stellar-mass black holes and supermassive black holes (SMBHs). BHs are observed indirectly through the accretion flow they emit, the supersonic, collimated jets they produce, and their gravitational…
Mary Somerville & Caroline Herschel: Google Doodle Google Doodle: Mary Somerville and Caroline Herschel The Google Doodle for 2 February 2020 celebrated Mary Somerville, the Scottish polymath and science writer, and Caroline Herschel, jointly the first women to be made honorary members of the Royal Astronomical Society (RAS). Early life and education Born in Jedburgh,…