The Hubble tension is one of the biggest mysteries in cosmology. It centers around the Hubble constant—the measurement of how fast our universe is expanding—which comes out as two different numbers ...

It centers around the Hubble constant—the measurement of how fast our universe is expanding—which comes out as two different numbers when calculated two different ways, even though those ...

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 ...

Cosmologists believe that our universe underwent a period of incredibly rapid expansion known as inflation. Powering this event was some mysterious substance in the universe, known as the ...

From mysterious dark matter to the radioactive decay of atomic nuclei, the past 12 months have reiterated just how strange ...

And the answer is: no, not really. But in some ways, yes. Look, it's complicated. Our universe is unimaginably vast and contains somewhere around 2 trillion galaxies. These galaxies aren't ...

Part 1 gives a brief outline of the general structure of the universe and Part 2 deals with the solar system, concluding with a short account of the origin of the sun and planets. Reference is ...

Gravitational lenses are like windows into the universe’s more ancient past, magnifying the details of deep time for our viewing pleasure. Miranda, as seen by Voyager 2 in 1986. Image ...