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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 answerI 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 answerIn 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 answerWhat 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 answerBetelgeuse 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 answerIf 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 answerIn 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 answerEnceladus, 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 answerIo'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 answerI 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
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