A new image from the Hubble Space Telescope beautifully illustrates why astronomers need to be so careful about distance in space.
from the Hubble Space Telescope beautifully illustrates why astronomers need to be so careful about distance in space.
But space is large, and there are a lot of things in it, so scientists must be careful when interpreting two objects that appear to be in the same place. Are they interacting, or are they overlapping with a vast distance in between?Distance is one of the most important tools we have for interpreting the Universe around us. Many objects' size, mass, and brightness can't be accurately gauged without an accurate distance measurement.
For relatively close objects, we can use parallax – the way objects move across the sky in relation to each other.
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