Stellar Parallax: Triangulating Distances to the Stars
<p>If you’ve noticed, all of them contain the variable <em>d</em>, distance. These are just some of the very basic equations used in astronomy, meaning there is a lot more information that can be derived from them alone.</p>
<p>In astrophysics, distance is what connects the intrinsic properties of an object like its true size and energy output, to its observable properties such as its apparent size and the energy we receive on Earth. In cosmology, distances to faraway galaxies can tell us the size, age, components, and history of the universe. To study the physics of an object, knowing its distance is a must.</p>
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