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1500 questions
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Does CIBER Experiment from Caltech suggest that there can be lots of stars which are not in any galaxy?
My question is about the implications of the observations recently made by the Cosmic Infrared Background Experiment, or CIBER, from Caltech. I've read at Caltech web site:
"The total light produced by these stray stars is about equal to the…
Charo
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How is the diameter of a gas giant calculated?
As we know atmospheres of celestial bodies don't just stop at a given distance. They gradually become less dense as you move away from the center.
I understand that the diameter of stars is typically given to be that of their photosphere (i.e. the…
nolandda
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12
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Why is there a black stripe in the Hubble images of Pluto?
While reading reports about the New Horizons misson, I noticed an odd vertical, black stripe in the images of Pluto.
Here is an example:
Source: Hubble Discovers a Fifth Moon Orbiting Pluto (07.11.12). Credit: NASA; ESA; M. Showalter, SETI…
Aaron Digulla
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12
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Explanation for the mathematics behind Venus' retrograde motion
I've always been interested by the pattern within Venus' orbit around the sun. I found this image and formula of its retrograde motion in the upper right hand corner which confused me. What does it mean? can someone break this down in layman's…
AppleFix88
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12
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How much of an effect does the moon have on Earth's liquid mantle?
The gravitational pull of the moon is enough to create tidal forces of large bodies of liquid, i.e the sea.
I was having a conversation the other day about how to terraform Mars, and someone suggested that if Mars was to have a moon artificially…
user96
12
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2 answers
How can astronomers determine the difference between "hydrostatic equilibrium" and "just happens to be spherical"?
This is relevant for the definition of a dwarf planet.
I presume the answer will be, well, if we can tell the mass of the body and guess the material. I don't find this very satisfactory because (1) may be impossible and (2) will have large error.
ThePopMachine
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12
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Do black holes have energy?
So black holes are created by certain dying stars and when the star runs out of nuclear energy gravity wins out and the star implodes. An entire star’s mass collapses down into a smaller and smaller volume of space. Which then creates a black hole,…
cow9000
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12
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Long term development of Comets
When an exocomet passes by our Sun in a trajectory that leads it to establish a Solar Orbit what eventually happens to it?
In addition to its original inertia and vector being altered what are the longer term affects that occur?
chaonomy
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How exactly is our universe mapped?
Watching this youtube video shows that our planet is nothing more than dust in the wind.
At the 2:50 mark in the video, you will see a view of the whole Milky Way. At the bottom you will see this text
Light travel time from earth: 100,000…
PrivateUser
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Why does the Moon never set in Svalbard, Norway?
I heard in a documentary that, in Svalbard (Spitsberg), Norwegian archipelago in the Arctic Ocean, the Moon never sets. Why? A drawing would certainly help.
Nicolas Barbulesco
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12
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Are there stars that don't emit visible light?
Are there stars that do not emit any light in the visible part of the EM spectrum?
user2317
12
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1 answer
Name of area close to Local Bubble?
The following image is a map of the area surrounding the Local Bubble. One side of the image is 1700 lightyears. From the Sun to the Hyades (immediately below the sun) it is 150 lightyears.
The local bubble, with the sun in its center, has three…
user2233
12
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0 answers
Estimating the tangential and cross component of the galaxy's shear using Gnomonic projection
I would like to know how I can estimate the tangential and cross component of the galaxy's shear using Gnomonic projection
of the right ascension and declination the galaxies relate to the center of galaxy cluster and estimate?
Edit. Shear is the…
Dalek
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What do Saturn's rings look like during a total solar eclipse, viewed from one of its moons?
Assuming the observer is standing on one of Saturn's moons, with an atmosphere and angle that allows them to see Saturn and its rings in the sky, what do the rings look like during a total solar eclipse? Are they dark? Are they illuminated with the…
SaintDiabolus
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12
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What are the negative results of SETI?
What are the negative results of the SETI project?
For instance, "there is no intelligent civilization within 50 light years from us which tries to broadcast a message to the solar system, assuming they are as developed as our civilization", or…
user31264
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