/u/grkirchhoff's posts in /r/askscience

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Is orbital energy lost through gravitational waves in all orbits, or only elliptical ortbits? Would a perfectly circular orbit create gravitational waves?

2921 upvotes

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Pictures of the earth don't show the stars because no camera has a high enough dynamic range to show both. Does the human eye have enough range?

535 upvotes

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Why is "that was just the initial condition" not considered as an answer to the horizon problem?

117 upvotes

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How can astronomers tell if a star is first generation, second generation, or later?

116 upvotes

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I know that Hawking radiation has never been detected, but if we were to attempt to detect it, what would we expect it to look like?

101 upvotes

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Is there any difference between philips and flathead screwdrivers in terms of performance, or is it arbitrary?

54 upvotes

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What experiment shows that gravity travels at the speed of light?

44 upvotes

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So what exactly is the dust that periodically coats everything in my house? Where does it come from?

37 upvotes

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Do dogs have the capacity to understand that if I step on their paw that it was an accident?

33 upvotes

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How can we say that "space" is expanding and not just the things in space are drifting apart?

32 upvotes

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Is orbital energy lost through gravitational waves in all orbits, or only elliptical ortbits? Would a perfectly circular orbit create gravitational waves?	2921
Pictures of the earth don't show the stars because no camera has a high enough dynamic range to show both. Does the human eye have enough range?	535
Why is "that was just the initial condition" not considered as an answer to the horizon problem?	117
How can astronomers tell if a star is first generation, second generation, or later?	116
I know that Hawking radiation has never been detected, but if we were to attempt to detect it, what would we expect it to look like?	101
Is there any difference between philips and flathead screwdrivers in terms of performance, or is it arbitrary?	54
What experiment shows that gravity travels at the speed of light?	44
So what exactly is the dust that periodically coats everything in my house? Where does it come from?	37
Do dogs have the capacity to understand that if I step on their paw that it was an accident?	33
How can we say that "space" is expanding and not just the things in space are drifting apart?	32