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Category: physics

New observations of the first black hole ever detected have led astronomers to question what they know about the Universe’s most mysterious objects.

Published today (February 182021) in the journal Science, the research shows the system known as Cygnus X-1 contains the most massive stellar-mass black hole ever detected without the use of gravitational waves.

Cygnus X-1 is one of the closest black holes to Earth. It was discovered in 1964 when a pair of Geiger counters were carried on board a sub-orbital rocket launched from New Mexico.

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It’s a fundamental law of physics that even the most ardent science-phobe can define: matter falls down under gravity. But what about antimatter, which has the same mass but opposite electrical charge and spin? According to Einstein’s general theory of relativity, gravity should treat matter and antimatter identically. Finding even the slightest difference in their free-fall rate would therefore lead to a revolution in our understanding. While the free fall of matter has been measured with an accuracy of around one part in 100 trillion, no direct measurement for antimatter has yet been performed due to the difficulty in producing and containing large quantities of it.

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A novel computer algorithm, or set of rules, that accurately predicts the orbits of planets in the solar system could be adapted to better predict and control the behavior of the plasma that fuels fusion facilities designed to harvest on Earth the fusion energy that powers the sun and stars.

The algorithm, devised by a scientist at the U.S. Department of Energy’s (DOE) Princeton Plasma Physics Laboratory (PPPL), applies machine learning, the form of artificial intelligence (AI) that learns from experience, to develop the predictions. “Usually in physics, you make observations, create a theory based on those observations, and then use that theory to predict new observations,” said PPPL physicist Hong Qin, author of a paper detailing the concept in Scientific Reports. “What I’m doing is replacing this process with a type of black box that can produce accurate predictions without using a traditional theory or law.”

Qin (pronounced Chin) created a computer program into which he fed data from past observations of the orbits of Mercury, Venus, Earth, Mars, Jupiter, and the dwarf planet Ceres. This program, along with an additional program known as a “serving algorithm,” then made accurate predictions of the orbits of other planets in the solar system without using Newton’s laws of motion and gravitation. “Essentially, I bypassed all the fundamental ingredients of physics. I go directly from data to data,” Qin said. “There is no law of physics in the middle.”

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Chair emeritus, SETI institute — the search for extraterrestrial intelligence.

Dr. Jill Tarter is Chair Emeritus for SETI (Search for Extraterrestrial Intelligence) Research at the SETI Institute, a not-for-profit research organization whose mission is to explore, understand, and explain the origin and nature of life in the universe, and to apply the knowledge gained to inspire and guide present and future generations.

Dr. Tarter received her Bachelor of Engineering Physics Degree with Distinction from Cornell University and her Master’s Degree and a Ph.D. in Astronomy from the University of California, Berkeley. She served as Project Scientist for NASA’s SETI program, the High Resolution Microwave Survey, and has conducted numerous observational programs at radio observatories worldwide. Since the termination of funding for NASA’s SETI program in 1993, she has served in a leadership role to secure private funding to continue the exploratory science. Currently, she serves on the management board for the Allen Telescope Array, an innovative array of 350 (when fully realized) 6-m antennas at the Hat Creek Radio Observatory, it will simultaneously survey the radio universe for known and unexpected sources of astrophysical emissions, and speed up the search for radio emissions from other distant technologies by orders of magnitude.

Dr. Tarter’s work has brought her wide recognition in the scientific community, including the Lifetime Achievement Award from Women in Aerospace, two Public Service Medals from NASA, Chabot Observatory’s Person of the Year award (1997), Women of Achievement Award in the Science and Technology category by the Women’s Fund and the San Jose Mercury News (1998), and the Tesla Award of Technology at the Telluride Tech Festival (2001). She was elected an AAAS Fellow in 2002 and a California Academy of Sciences Fellow in 2003. In 2004 Time Magazine named her one of the Time 100 most influential people in the world, and in 2005 Dr. Tarter was awarded the Carl Sagan Prize for Science Popularization at Wonderfest, the biannual San Francisco Bay Area Festival of Science.

Dr. Tarter is deeply involved in the education of future citizens and scientists. In addition to her scientific leadership at NASA and SETI Institute, Dr. Tarter was the Principal Investigator for two curriculum development projects funded by NSF, NASA, and others. The first, the Life in the Universe series, created 6 science teaching guides for grades 3–9 (published 1994–96). Her second project, Voyages Through Time, is an integrated high school science curriculum on the fundamental theme of evolution in six modules: Cosmic Evolution, Planetary Evolution, Origin of Life, Evolution of Life, Hominid Evolution and Evolution of Technology (published 2003).

Dr. Tarter is a frequent speaker for science teacher meetings and at museums and science centers, bringing her commitment to science and education to both teachers and the public.

Many people are now familiar with her work as portrayed by Jodie Foster in the movie Contact. She is also the subject of the book, Making Contact: Jill Tarter and the Search for Extraterrestrial Intelligence.

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SpaceX won a NASA contract Feb. 4 to launch a small astrophysics mission, continuing its string of similar agency contracts over the last two years.

WASHINGTON — SpaceX won a NASA contract Feb. 4 to launch a small astrophysics spacecraft, continuing the company’s string of similar agency contracts over the last two years.

NASA awarded a contract to SpaceX for the launch of the Spectro-Photometer for the History of the Universe, Epoch of Reionization, and Ices Explorer (SPHEREx) spacecraft on a Falcon 9 in June 2024. The value of the launch contract is $98.8 million, which includes the launch itself and other “mission-related costs,” the agency said.

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In a new report on Science Advances, Mark Elowitz, and a team of scientists in physical sciences, optical physics, planetary science and radiation research in the U.S., U.K., India, and Taiwan, presented the first analysis of far-ultraviolet reflectance spectra of regions on Rhea’s leading and trailing hemispheres—as collected by the Cassini ultraviolet imaging spectrograph during targeted flybys. In this work, they specifically aimed to explain the unidentified broad absorption feature centered near 184 nanometers of the resulting spectra. Using laboratory measurements of the UV spectroscopy of a set of molecules, Elowitz et al. found a good fit to Rhea’s spectra with both hydrazine monohydrate and several chlorine-containing molecules. They showed hydrazine monohydrate to be the most plausible candidate to explain the absorption feature at 184 nm.

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MIT researchers and colleagues have discovered an important—and unexpected—electronic property of graphene, a material discovered only about 17 years ago that continues to surprise scientists with its interesting physics. The work, which involves structures composed of atomically thin layers of materials that are also biocompatible, could usher in new, faster information-processing paradigms. One potential application is in neuromorphic computing, which aims to replicate the neuronal cells in the body responsible for everything from behavior to memories.

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Nikolai Kardashev, creator of the civilization ranking scale, outstanding space explorer, specialist in experimental and theoretical astrophysics and radio astronomy, Doctor of Physical and Mathematical Sciences, Director of the Astro Space Center of the Lebedev Physical Institute, died in August 3, 2019. The Russian scientist was 87 years old.

The scientist’s most famous work is the Kardashev Scale — the cosmic civilization ranking system. As part of the Search for Extraterrestrial Intelligence (SETI), he proposed a model of cosmic civilisations and calculated the scale of ranking civilisations

The Kardashev Scale

In 1963, he studied the quasar CTA-102. It was the first contribution of Soviet scientists to SETI, since the radio source CTA-102 was first assumed to be evidence of an extraterrestrial civilization.

In his paper ‘Transmission of Information by Extraterrestrial Civilisations’, published in 1964, Kardashev explored the idea that other galactic civilisations may have existed for billions of years before ours, so they would be far more advanced. He proposed a theoretical scale of technological development of civilisations based on the amount of energy that civilization is able to utilize. According to the theory, there are 3 main types of advanced civilisations:

Type I: Planetary Civilization

A civilisation that can use and store all the energy available on its planet — a small fraction of a star’s energy emissions that reach the surface. In the case of Earth and the Sun that’s about 1016 watts. For now, humanity has not quite reached Type I civilisation status, consuming only about 1012 watts.

Type II: Stellar Civilization

A civilization in possession of resources of its parental star and could control the energy in their solar system, by exploiting the total energy output of the star. Such a civilization could meet its energy requirements by building an equivalent of what is known as the Dyson sphere, a number of structures that surround a star in a dense formation to capture a large percentage of its power output, making available 1026 watts of energy. The concept was proposed by American physicist and mathematician Freeman Dyson in 1960.

Type III: Galactic Civilization

A civilization that has evolved so far it possess the energy resources of their entire galaxy. This would give a further increase in energy consumption to at least 1036 watts.
The author of the theory didn’t suppose that further increase in energy consumption is possible, so he didn’t propose a Type IV.

The Kardashev Scale is used by physicists and futurists all over the world to this day. Michio Kaku, professor of theoretical physics and futurist in his book ‘Physics of the Future’, claims that humanity may attain Planetary Civilization status in just 100 years. Carl Edward Sagan, American astronomer, astrobiologist and astrophysicist supported the theory, too, however, pointed out that the energy gaps between Kardashev’s civilization types of were so great that the scale might need to be refined with additonal ranking

Becoming an Astrophysics legend

However, his contribution to the Search for Extraterrestrial Intelligence isn’t the only achievement the scientist is worth to be remembered for. Kardashev produced pioneering work on low frequency cosmic radiation that started a new era in radio astronomy, he conducted numerous experiments and took part in telescope developments, studied the active nuclei of galaxies, quasars, and stellar systems.

In the early 1960s, Kardashev predicted the discovery of pulsars — highly magnetized rotating neutron stars that emit electromagnetic radiation. The radiation can be observed only when the beam of emission is pointing toward Earth and is responsible for the pulsed appearance of emission.

One of his latest contributions to science was the work on the radio telescope Spektr-R, launched in 2011 to perform research on the structure and dynamics of radio sources in our galaxy and beyond.

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