TED-Ed: Could comets be the source of life on Earth? - Justin Dowd

Comets have been seen as omens throughout history, but recent research suggests they may be crucial to the origin of life on Earth. The Solar System contains icy bodies beyond Neptune, some of which are pulled towards the Sun, forming comets. As they approach, they develop a coma and tail, reflecting sunlight. Comets may have delivered amino acids, the building blocks of life, to Earth. With many stars having Earth-like planets, comets could seed life elsewhere, suggesting a future where humanity explores its cosmic origins.

What was the historical belief about comets when they appeared in the sky?

• They were seen as signs of good fortune.

• They were considered omens of war and famine.

• They were believed to be messages from aliens.

• They were thought to bring rain and prosperity.

What happens to a comet as it approaches the Sun?

• It loses its tail and becomes invisible.

• It forms a bright surrounding cloud called a coma.

• It becomes colder and more solid.

• It stops moving and remains stationary.

What is the role of the solar wind in the transformation of a comet?

• It heats the comet, causing it to explode.

• It pushes the comet away from the Solar System.

• It blows particles away from the comet's core, forming a tail.

• It causes the comet to change color.

What significant discovery was made in the rubble of a meteorite and comet samples?

• Traces of water.

• Amino acids, the building blocks of life.

• Rare metals like gold and silver.

• New types of gases.

How might comets have contributed to the origin of life on Earth?

• By creating the atmosphere.

• By seeding Earth with organic molecules like amino acids.

• By bringing water to the planet.

• By providing heat and light.