Universe Expansion articles

What happens if the universe expands too fast?

The universe isn't just getting bigger; it’s stretching at an ever-increasing rate, a phenomenon that has left cosmologi...

How did Galileo's discovery of the Galilean moons of Jupiter impact our understanding of the universe?

The initial flicker of light Galileo Galilei noticed in January of 1610, when pointing his newly improved telescope towa...

Is the Milky Way a universe or galaxy?

The bright band we sometimes see arching across a truly dark night sky—the Milky Way—is one of the most recognizable cel...

Why is hydrogen so important to the universe?

The initial appearance of hydrogen, the simplest of all elements, sets the stage for everything that has ever been obser...

How many galaxies are there in the cosmos universe?

Trying to pin down the exact number of galaxies scattered across the cosmos is one of astronomy’s most humbling exercise...

What is the largest structure in the hierarchy of the universe?

The grand architecture of the cosmos is arranged in a pattern far grander than any human-made city or nation; it is a va...

Are supernovas the brightest thing in the universe?

The sudden illumination of a dying star represents one of the most profound light shows the universe can produce. For a ...

Is the universe red-shifted?

The light reaching us from distant galaxies carries an unmistakable signature written into its very fabric, a clue that ...

Is the universe experiencing red shift or blue shift?

The light from the overwhelming majority of objects in the cosmos arrives stretched, meaning the universe, on its grande...