The observable universe is a ball-shaped region of the universe comprising all matter that can be observed from Earth or its space-based telescopes and exploratory probes at the present time, because ...

Our journey to comprehend the Universe’s edge begins with the concept of the observable Universe. This term refers to the portion of the cosmos that we can theoretically detect from Earth.

But from where Earth sits in the observable universe, our view extends more than 13 billion years into the past. Far outside our Local Group, astronomers have found galaxies so metal-poor and so ...

The structure and composition of the observable universe, within the framework of the theory, depend on how microcells proliferated, and how their energies evolved, during inflation. Each macrocell ...

Over 40 stars in a galaxy billions of light-years away were photographed, offering a glimpse into an era when the universe ...

This is just a small part of the universe—less than 1% of the entire observable universe—but it is our galactic neighborhood. And it is good to know the geography of your neighborhood.