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

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How do we know if a thermometer is accurate? Should we trust that the local weather service has accurate thermometers?

3034 upvotes

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When we see pictures of the Milky Way, we see clusters of colors (sometimes green or yellow or or purple) between the stars. What is this colored stuff?

9 upvotes

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If I strapped an extremely powerful magnet to the front of my body, would I be able to "feel" which way is north?

4 upvotes

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How certain are we that the Earth has remained the same distance from the sun for millions of years?

1 upvotes

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
How do we know if a thermometer is accurate? Should we trust that the local weather service has accurate thermometers?	3034
When we see pictures of the Milky Way, we see clusters of colors (sometimes green or yellow or or purple) between the stars. What is this colored stuff?	9
If I strapped an extremely powerful magnet to the front of my body, would I be able to "feel" which way is north?	4
How certain are we that the Earth has remained the same distance from the sun for millions of years?	1