Cosmic Distance Scale

The observable Universe is the space-time region around Earth. The light from the object very close to the boundary of the space-time region must have travelled a distance of 13.7 billion light-years to reach Earth. In the Universe, there are various types of objects, including stars galaxies, quasars, etc. Human beings have observed the object that is more than 10 billion light-years away from Earth at present. Let's explore the depths of the Universe from Earth.