Just like the dust that stubbornly besmirches your computer monitor, bookcase, and ancestral credenza, cosmic dust is now recognized to have a multiplicity of origins. For decades, astronomers thought that aging red giant stars produced most of the dust responsible for obscuring and reddening our views of nebulae and more distant stars ...
There are definite interrelations between the spacings of the planets – they are much more than giant rocks randomly flying through space. There is order and a scheme, a cosmic dance of the planets as some romantics like to say.
An astronomical year for me ….When I was in the third grade I suddenly became very interested in everything astronomical – especially the planets of our local solar system. That same year we studied the Solar System in public school, and that only added to my excitement over the topic. I began badgering my parents to buy me a telescope...
It is tempting to say that any well-educated person should know what it takes to be scientifically literate. But what does scientific literacy really involve? Given that scientific literacy is a key goal of most science education standards and frameworks, considerable ink has been dedicated to utilizing the term in pedagogical papers.
Africa’s astronomical debut has come at an opportune time, as a multitude of facilities and projects have taken root across the continent in the service of astronomical questing.
Astronomy encompasses the fields of Planetary Science (including Earth as a planet), Heliophysics, Astrophysics, Astrochemistry, Astrobiology, Cosmology, and Cosmogony – the study of cosmic origins. Astronomy, in turn, is informed by the core sciences of Physics, Chemistry, and Biology. It both depends upon and helps to advance technological innovation...
Each year, the American Astronomical Society (AAS) hosts two big meetings in January and June that span all of astronomy and its subfields of cosmology, helioastronomy, and planetary science. The COVID-19 pandemic took its toll, beginning in June 2020, when the meeting format pivoted to online presentations. The January 2022 meeting was canceled outright, but by June 2022, the society pivoted again, offering a hybrid mix of in-person and online formats. These two meetings underscored the unquenchable thirst for astronomical questing among our veteran and rising scientists. Here are a few highlights from these meetings.
Fast Radio Bursts are flashes of radio emission lasting for several milliseconds. The time of arrival of signals depends on the radio frequency, called the dispersion measure (DM), which depends on the environment through which the signals travel, specifically the number of free electrons in their path. Very few FRBs have matches with sources observed at other wavelengths (Wikipedia - Fast Radio Burst).
The formula for collisional excitation of the atoms responsible for auroral emission can explain why green auroras from excited oxygen atoms can occur at relatively low altitudes, but red auroras from these same atoms are constrained to higher altitudes of lower density. The same formula also suggests much lower electron velocities (~100 km/s) than are required to excite the oxygen atoms to the required metastable levels for subsequent emission (~1000 km/s).
Sobel’s most recent novel The Glass Universe (2016) is split into three parts, “The Colors of Starlight,” “Oh, Be A Fine Girl, Kiss Me,” and “In the Depths Above.” Each part is further structured quite nicely into titled chapters that relate to the subject or person of interest. The book’s sweep is chronological, starting with Mary Anna Palmer Draper – the wife of astronomer Henry Draper.
