“Who are you, my readers?”

“Who are you, my readers?” - Hi tumblr! Astroquizzical is participating in a first-of-its-kind scientific survey of the people who read science blogs, and why! But the survey needs your participation!If you have read any Astroquizzical posts (ever), you can participate! Click on the link here: http://bit.ly/mysciblogreaders !At least 2 of you will definitely get a $50 prize to thank you for your time, and there are art prizes for everyone who completes the survey. …

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“Who are you, my readers?”

“Who are you, my readers?” - Hi tumblr! Astroquizzical is participating in a first-of-its-kind scientific survey of the people who read science blogs, and why! But the survey needs your participation!If you have read any Astroquizzical posts (ever), you can participate! Click on the link here: http://bit.ly/mysciblogreaders !At least 2 of you will definitely get a $50 prize to thank you for your time, and there are art prizes for everyone who completes the survey. …

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“Why doesn’t a globular star cluster collapse into a single body due to the mutual gravitational…”

“Why doesn’t a globular star cluster collapse into a single body due to the mutual gravitational effects of the individual stars?” - Globular clusters are strange objects. They’re incredibly old collections of a huge number of stars — somewhere around a few hundred thousand on average, and they orbit around the very edges of galaxies, dotted spherically around. Our own Milky Way has a few hundred that we’ve found — Andromeda, the nearest other large galaxy we can check,…

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“Each galaxy is expanding away from the others. As a result, would that mean we require more time in…”

“Each galaxy is expanding away from the others. As a result, would that mean we require more time in the future to travel to other galaxies as the space in between increases as well?” - It depends on how far you want to go! Generally, when an astronomer is trying to explain the idea of space expanding, they might use the idea of the space between two galaxies expanding. This is a good illustration; it…

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“If black holes are infinitely dense and the laws of physics break down, why are they only as massive…”

“If black holes are infinitely dense and the laws of physics break down, why are they only as massive as the stars that created them? Why can’t they draw more mass from the bulk?” - A black hole is a rather complicated cosmic object, and one of the most common misconceptions about them is that they’re some kind of universal vacuum cleaner, constantly sucking material…Read the full article at Forbes!Have your own question?  Feel free…

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“Is there gold on Mars? Could there be gold, agates, or geodes?”

“Is there gold on Mars? Could there be gold, agates, or geodes?” - It’s certainly plausible! Why? On Earth, each of these things has something in common, that Mars also has: volcanoes.Gold, like all elements in the periodic table heavier than iron, is formed exclusively when very large stars explode at the end of their lifetimes. The entire Earth’s reservoir of gold is the collected remains of these explosions, created well before our solar system…

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“Could black holes be the engines of new galaxies?”

“Could black holes be the engines of new galaxies?” - A very good question! Black holes are interesting objects, and still somewhat scientifically perplexing ones, particularly when it comes to determining how they interact with the galaxy they live within. As a first filter, though, we can ignore all of the small, stellar mass black holes that hang out throughout the disk of a galaxy. These small black holes, while they’re still fascinating objects, and…

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“Does the Sun have a magnetic north and south pole like the Earth or a bar magnet?”

“Does the Sun have a magnetic north and south pole like the Earth or a bar magnet?” - It does!Bar magnets are some of the simplest magnetic objects that are out there - with a positive end and a negative end, and a smooth connection of field lines connecting top to bottom, cylindrically encasing the whole magnet. If you’ve ever played with any of those “doodle a hairdo” games that are made of iron filings,…

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“I’ve heard the idea that spacetime needs to be constantly created in the universe. Could this happen…”

“I’ve heard the idea that spacetime needs to be constantly created in the universe. Could this happen uniformly throughout the universe, or would it start from a definite point like a whirlpool in reverse. How would we tell which of these is true?” - To properly answer this question, we have to drift backwards in time a bit, to understand where the idea that the universe is expanding comes from in the first place. The…

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“Why do galaxies have two spiral arms?”

“Why do galaxies have two spiral arms?” - Only a small fraction of galaxies actually have two spiral arms! Even if we ignore the entire class of galaxies dubbed “ellipticals”, which have no spiral arms at all, there are a ton of spiral galaxies with a number of arms not equalling two.Spiral galaxies are one half of the larger galaxy population; the overall population is generally divided into spirals and ellipticals. Spirals are also known…

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