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Astronomy : Recent Questions and Answers (Page 6)

Find answers to your questions about Astronomy or help others by answering their Astronomy questions.

How do we know that the discovered M87 black hole isn't just a star surrounded by a dust disk?

To an untrained eye like mine, pictures of stars surrounded by dust discs look very much similar to the picture of the M87 black hole. Here are some pictures of...

Asked on 09/28/2021

1 answer

Where are the two recently confirmed unusual brown dwarfs?

The News report of two confirmed unusual T-type brown dwarfs but they don't tell where in space or on the night sky they were found or how far...

Asked on 09/28/2021

1 answer

Help stabilizing telescope

First time astronomer here... (pardon any less than accurate terminology) My son received a secondhand telescope, a Celestron Powerseeker 114AZ. Last night I calibrated the Starpointer, and was able...

Asked on 09/28/2021 by FrancisJohn

1 answer

Does anyone have spectra on exoplanet HD 219134b? How could one know either way?

I have foraged through the internet to no avail. Is there a way to systematically check if spectra from a given exoplanet has been reported, like a catalog or list...

Asked on 09/28/2021

1 answer

Why has Venus's atmosphere not been stripped away by solar wind?

This answer on Space Exploration to a question about Mars says that one reason Mars has such a thin atmosphere is because it lacks a magnetic field to protect...

Asked on 09/28/2021 by called2voyage

2 answer

Can the period of the planet transit across the sun be calculated in the same way the eclipse year is?

I read from Wikipedia$-$Eclipse cycle that the eclipse year, which is the period of Earth's hitting a certain node of its orbit around the sun, that is, the...

Asked on 09/28/2021 by Captain Bohemian

1 answer

How much of a molecular cloud can end up as "starstuff"?

Stars form within molecular clouds. These clouds can be up to 6 millions solar masses. When the cloud collapses into stars, is it possible to know a...

Asked on 09/28/2021

1 answer

Was the "green star" event in NGC 3314 ever figured out or named?

from NGC 3314 Variable Object by By Bill Keel (University of Alabama, Tuscaloosa) and Lisa Frattare (Hubble Heritage Project,...

Asked on 09/28/2021

1 answer

Is there any thing special with an axial tilt of roughly 25°?

Half of the planets in the solar system have an axial tilt of $25.5pm 3^circ$: earth (23.5°), mars (25.3°), saturn (26.7°) and neptune (28.3°). If random collisions in the...

Asked on 09/28/2021

1 answer

Where do the symbols $lambda$ and $beta$ come from for celestial latitude and longitude?

I'm reading Episodes From the Early History of Astronomy, and the author mentions the system of celestial coordinates based on the ecliptic. In this...

Asked on 09/28/2021

1 answer

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