The Galactic Inquirer

Interstellar Communications

How to Talk to Aliens

If we ever make contact with an alien civilization, how will we understand what they’re saying? That’s the question that preoccupies John Elliott of...

Interstellar Communications

Introduction: It took less than two billion years for our Milky Way Galaxy to emerge from the chaos of the Hot Big Bang some 13.8...

Latest news

Dispatches from the Cosmos (2022-2023)

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.

Surfing The Auroral Cascade: Quantitative Constraints on Oxygen Forbidden-line Emissions and Exciting Electron Velocities

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).

Statistical Properties of Fast Radio Bursts from the CHIME/FRB Catalog 1: The Case for Magnetar Wind Nebulae as Likely Sources

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).

You might also likeRELATED
Recommended to you

How the Earth Got its Water

Water has been identified in the most uncanny of...

Earth & Space Report #4: Galactic Blowhards

Galaxies comprise the largest self-gravitating systems of luminous matter in the universe, swirling masses of matter and energy just looking for trouble. Over the past few decades, astronomers have come to appreciate how fervently active galaxies can be. Besides hosting roiling clouds of intense starburst activity, they often also sport supermassive black holes in their centers that can pack a powerful punch. These myriad histrionics can affect the host galaxy's subsequent evolution and even the destinies of neighboring galaxies.

Interstellar Communications

Introduction: It took less than two billion years for our...