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Astronomy : Recent Questions and Answers

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

How do astronomers detect the 'metals' in a star? If the atoms are presumably completely ionized?

Atoms and molecules usually emit their characteristic wavelengths because of the electrons' energy levels.... Do the completely ionized ('naked') nuclei absorb and/or emit EM radiation? If so, at what type...

Asked on 01/06/2022

2 answer

Do free protons and neutrons absorb much radiation? To affect astronomers' observations? If so, at what wavelength(s)?

In a plasma, or wherever, do the completely ionized nuclei commonly absorb much EM radiation? Or any free neutrons or protons? Can astronomers detect this? Enough so...

Asked on 01/04/2022

1 answer

Why don't (or can't) stars be more than 325 or so times the mass of the sun? What limits their size?

Is there a particular reason why stars cannot grow as massive as they want to? And why doesn't this limit apply to supermassive black holes?...

Asked on 01/04/2022

1 answer

Can Jupiter's nightside be classified as spectral type Y?

As far as I am aware, the latest spectral types that have been assigned are around Y2, for objects like WISE 0855-0714 that have temperatures around 250...

Asked on 12/28/2021 by user24157

1 answer

Why are Delta Aquariids "for the southern hemisphere" while the Perseids are "for the north"?

In the video How to spot Comet NEOWISE, plus the largest 3D map of the Universe | Night Sky News July 20 after 05:28 Dr. Becky (Smethurst,...

Asked on 12/26/2021

1 answer

How do OGLE-III and GAIA measure the mass of free microlensing black holes?

What is the "hypothesized lower mass gap" between 2.5 and 5 solar masses? eventually links to Constraining the masses of microlensing black holes and the mass...

Asked on 12/24/2021

1 answer

How much solar UV radiation would someone get who were on the surface of Titan?

The Saturn system is about 10 times as far from the Sun as the Earth. This question is concerning Titan for two reasons: Titan has an Earthlike atmosphere so you...

Asked on 12/24/2021

1 answer

What effects does the motion of the Sun have on the perihelion precession of Mercury?

According to the wikipedia page, there are multiple effects contributing to the perihelion precession of Mercury. Of course, according to this link and ...

Asked on 12/21/2021

2 answer

Get the expression of probed volume between 2 redshifts

1) I can't manage to find/justify the relation (1) below, from the common relation (2) of a volume. 2) It seems the variable r is actually the comoving distance and...

Asked on 12/16/2021

0 answer

Is there a good replacement finder scope for the Celestron 127EQ?

I've had a Celestron 127EQ for a couple years now and have only used it a couple times. One of the reasons I haven't gotten much use out of it...

Asked on 12/16/2021 by theMikeSwan

0 answer

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