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Astronomy : Recent Questions and Answers (Page 7)

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

Where do we define the "surface" of a gas planet?

Since gas giant consist of most gas components, where do we establish their "surface"? My take is basically to take the limit in which all light is opaque. For example,...

Asked on 09/28/2021 by Carlos Vázquez Monzón

2 answer

How can I correct for transit time?

I know the exact time a radio telescope detected a transient event. I also know the exact location of the telescope, and the galactic coordinates (galactic longitude, latitude) and right...

Asked on 09/28/2021 by PerplexedDimension

1 answer

What does BJD-2450000 mean?

In different papers I've encountered time indications in BJD-2450000. I know that BJD stands for Barycentric Julian Date, but I don't understand the meaning of the suffix -2450000. ...

Asked on 09/28/2021 by Laila

3 answer

Why didn't we see those campfires on the Sun until now?

What is it about its optics and instrumentation (aperture, sensors, filters), being in space and distance from the Sun on 30 May 2020 that allowed Solar Orbiter's HRIEUV telescope to...

Asked on 09/28/2021

1 answer

How far from Betelgeuse is its habitable zone?

Betelgeuse is a red supergiant or hypergiant in the constellation Orion. It is one of the biggest and brightest stars seen from the Earth, and is expected to soon go...

Asked on 09/28/2021

3 answer

Observing cepheid variables in other galaxies

If individual stars cannot be seen in other galaxies (excluding satellite galaxies of the Milky Way) then how can light from cepheids other galaxies be observed?...

Asked on 09/28/2021 by ARinLA

1 answer

What does "the depth of the 13.0 Å feature differs by 7 sigma from zero" mean?

In a paper I've read, I have seen the following:In view of the noise levels, it is difficult to perform such a search effectively using statistical significance criteria only. We...

Asked on 09/28/2021 by Chen

1 answer

Do Enceladus' geysers fall back to its surface or do they achieve escape velocity?

Enceladus, a moon of Saturn, has a very low surface gravity at 0.114 m/s² or 0.012 g. It has a subsurface ocean of liquid water and is ejecting plumes of...

Asked on 09/28/2021

1 answer

How does Io's atmosphere behave locally near volcanic plumes?

Io's surface air pressure is about $0.3 {rm mPa}$ but Io's atmosphere is strongly variable, depending on whether it's on the near side or far side of Io (relative...

Asked on 09/28/2021

1 answer

Comet Neowise c2020 f3 will return in ~6800 years, how can we be sure Earth will be in the right place to see it then?

I have read in several places that the orbital period of comet Neowise c2020 F3 is about 6800 years. In several popular media sources it is said that we will...

Asked on 09/28/2021

3 answer

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