Supernova

In large size stars, nuclear fusion will continue until iron is formed. In stars, iron acts like an energy sponge. It soaks up the star's energy. This energy is eventually released in a big explosion called a supernova.

One night in 1572, Danish astronomer Tycho Brahe saw what he thought was a brilliant new star in the constellation Cassiopeia. (We now know he was observing a supernova.) In 1604, a second supernova was observed. These discoveries caused scientists to seriously question Ptolemy's theory that all stars were contained in an outermost sphere of the universe that never changed.

When a massive star dies, it runs out of fuel, collapses under its own weight and explodes as a supernova.

Roman will use multiple methods to investigate dark energy. One involves surveying the sky for a special type of exploding star, called a type Ia supernova.

Mary wasn't the type of person who was destined to grow old. She was like a supernova in the sky, one might say: as with most of us, an inconspicuous, perhaps even invisible, star which then breaks out as an explosion of light to become one who briefly outshines all others, only to tragically end while others are not nearly as bright but shine on.

The supernova shone so brightly that it cast a shadow on Earth.

Every thirty years a star explodes in our Galaxy and becomes a supernova.

A newly discovered supernova that astronomers say is the brightest exploding star ever seen is baffling scientists all over the world.

A supernova is the explosive death of a star, releasing massive energy.

Cornelius was the only one dressed in muscle but collectively they were a bully supernova.