I was reading about telescopes and the Hubble Telescope for example has a 2.4m mirror which reflects lights to a sensor. Other type of telescopes use lenses to focus light to the imaging sensor.
I was wondering, is it possible to have a telescope without a mirror or lens? So in Hubble's case, instead of having a 2.4m mirror reflecting light to a small sensor, why not have a big imaging sensor (same size as the mirror - 2.4m). Would this type of telescope have similar capabilities as the mirror one?
I know that we use mirrors because it's way cheaper and easier than building large sensors but I'm curious if a mirror-less telescope would be better / worse or just the same.