A supernova is a powerful and luminous explosion of a star. A supernova occurs during the last evolutionary stages of a massive star, or when a white dwarf is triggered into runaway nuclear fusion. The original object, called the progenitor, either collapses to a neutron star or black hole, or is completely destroyed to form a diffuse nebula. The peak optical luminosity of a supernova can be comparable to that of an entire galaxy before fading over several weeks or months.
Betelgeuse is a red supergiant star in the constellation of Orion. It is usually the tenth-brightest star in the night sky and, after Rigel, the second-brightest in its constellation. It is a distinctly reddish, semiregular variable star whose apparent magnitude, varying between +0.0 and +1.6, has the widest range displayed by any first-magnitude star. Betelgeuse is the brightest star in the night sky at near-infrared wavelengths. Its Bayer designation is α Orionis, Latinised to Alpha Orionis and abbreviated Alpha Ori or α Ori.
A variable star is a star whose brightness as seen from Earth changes systematically with time. This variation may be caused by a change in emitted light or by something partly blocking the light, so variable stars are classified as either:
A blue supergiant (BSG) is a hot, luminous star, often referred to as an OB supergiant. They are usually considered to be those with luminosity class I and spectral class B9 or earlier, although sometimes A-class supergiants are also deemed blue supergiants.
A near-Earth supernova is an explosion resulting from the death of a star that occurs close enough to the Earth to have noticeable effects on Earth's biosphere.
A Type Ia supernova is a type of supernova that occurs in binary systems in which one of the stars is a white dwarf. The other star can be anything from a giant star to an even smaller white dwarf.
Nancy Grace Roman was an American astronomer who made important contributions to stellar classification and motions. The first female executive at NASA, Roman served as NASA's first Chief of Astronomy throughout the 1960s and 1970s, establishing her as one of the "visionary founders of the US civilian space program".
Alexei Vladimir "Alex" Filippenko is an American astrophysicist and professor of astronomy at the University of California, Berkeley. Filippenko graduated from Dos Pueblos High School in Goleta, California. He received a Bachelor of Arts in physics from the University of California, Santa Barbara in 1979 and a Ph.D. in astronomy from the California Institute of Technology in 1984, where he was a Hertz Foundation Fellow. He was a postdoctoral Miller Fellow at Berkeley from 1984 to 1986 and was appointed to Berkeley's faculty in 1986. In 1996 and 2005, he was a Miller Research Professor, and he is currently a Senior Miller Fellow. His research focuses on supernovae and active galaxies at optical, ultraviolet, and near-infrared wavelengths, as well as on black holes, gamma-ray bursts, and the expansion of the Universe.
St. Stephen's Episcopal School is a private coeducational preparatory boarding and day school in Austin, Texas. Enrollment for the 2019-20 academic year is approximately 694, with 487 students in grades 9–12 and 207 in grades 6–8. Of the school's 694 students, 523 are day students and 171 are boarding students. The school's campus overlooks Lake Austin and is spread across 370 acres (1.5 km2) of the Texas Hill Country. The school is accredited by The Association of Boarding Schools, Independent Schools Association of the Southwest, the Southwestern Association of Independent Schools, the National Association of Episcopal Schools, the National Association of Independent Schools, National Association for College Admission Counseling, and the Association of College Counselors in Independent Schools.
Adam Guy Riess is an American astrophysicist and Bloomberg Distinguished Professor at Johns Hopkins University and the Space Telescope Science Institute. He is known for his research in using supernovae as cosmological probes. Riess shared both the 2006 Shaw Prize in Astronomy and the 2011 Nobel Prize in Physics with Saul Perlmutter and Brian P. Schmidt for providing evidence that the expansion of the universe is accelerating.
SN 2008ha was a type Ia supernova which was first observed around November 7, 2008 in the galaxy UGC 12682, which lies in the constellation Pegasus at a distance of about 21.3 megaparsecs (69 Mly) from Earth.
Victoria Michelle Kaspi is a Canadian astrophysicist and a professor at McGill University. Her research primarily concerns neutron stars and pulsars.
Pilar Ruiz-Lapuente is an astrophysicist working as a professor at the University of Barcelona. Her work has included research on type Ia supernovae. In 2004, she led the team that searched for the companion star to the white dwarf that became supernova SN 1572, observed by Tycho Brahe, among others. Ruiz-Lapuente's research on supernovae contributed to the discovery of the accelerating expansion of the universe.
Alicia Margarita Soderberg is an American astrophysicist whose research focused on supernovae. She was an assistant professor of astronomy at Harvard University and a postdoctoral fellow at the Harvard-Smithsonian Center for Astrophysics.
Vassiliki Kalogera is a Greek astrophysicist. She is a professor at Northwestern University and the director of the Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA). She is a leading member of the LIGO Collaboration that observed gravitational waves in 2015.
Jennifer Hoffman is an American astrophysicist and associate professor at the University of Denver. She studies the circumstellar material around stars.
JJ Eldridge is a theoretical astrophysicist based in New Zealand. Eldridge is the head of the Department of Physics at the University of Auckland and co-author of The Structure And Evolution Of Stars.
Angela Karen Speck is a Professor of Astrophysics and the Chair of the Department of Physics & Astronomy at the University of Texas at San Antonio. She works on infrared astronomy and the study of space dust. She is a popular science communicator, and was co-chair of the National Total Solar Eclipse Task Force.
Annette S. Lee is an American astrophysicist and professional artist. Lee is the director of Native Skywatchers, a program created to record, map, and share Indigenous star knowledge. She is mixed-race Lakota and works with Ojibwe, Dakota and Lakota communities to preserve those cultures' astronomical and ecological knowledge.
