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• Fake email addresses - Malicious actors sometimes send from email addresses made to look like an official email address but in fact is missing a letter(s), misspelled, replaces a letter with a lookalike number (e.g. “O” and “0”), or originates from free email services that would not be used for official communications.
AOL Mail is focused on keeping you safe while you use the best mail product on the web. One way we do this is by protecting against phishing and scam emails though the use of AOL Official Mail. When we send you important emails, we'll mark the message with a small AOL icon beside the sender name.
The Astrophysics Source Code Library (ASCL) is an online registry of scientist-written software used in astronomy or astrophysics research.The primary objective of the ASCL is to make the software used in research available for examination to improve the transparency of research.
Skyglobe accounts for the earth's precession in its calculations and should therefore be accurate to tens of thousands of years in the past and the future, but its manual does warn that the positions of planets might not be accurate throughout this range (it says "their coordinates are approximately correct for as far back and forward as we have data").
Download QR code; Print/export Download as PDF; Printable version; In other projects ... Pages in category "Equations of astronomy" The following 71 pages are in this ...
As an offshoot of the disciplines of astronomy and chemistry, the history of astrochemistry is founded upon the shared history of the two fields. The development of advanced observational and experimental spectroscopy has allowed for the detection of an ever-increasing array of molecules within solar systems and the surrounding interstellar medium.
It is customary in astronomy to use the Roman numeral I for neutral atoms, II for singly-ionized—HII is H + in other sciences—III for doubly-ionized, e.g. OIII is O ++, etc. [1]) These regions do not emit detectable visible light (except in spectral lines from elements other than hydrogen) but are observed by the 21-cm (1,420 MHz) region ...
However, there is also a specific, quantitative definition of "opacity", used in astronomy, plasma physics, and other fields, given here. In this use, "opacity" is another term for the mass attenuation coefficient (or, depending on context, mass absorption coefficient , the difference is described here ) κ ν {\displaystyle \kappa _{\nu }} at ...