asteroids

/Tag: asteroids
17 08, 2017

What is a Comet? – Astronomy – Space

By |2019-04-18T05:32:51-07:00August 17th, 2017|Physics|0 Comments

A comet in the night sky What are comets made of? Comets are balls of leftover rock and ice in space. They started out when a star exploded into a supernova. What is a supernova? More about ice All our space articles When were the first comets? A nebula formed, and then most of the material in our nebula merged together, about [...]

23 06, 2017

What happened in the Archaean Eon?

By |2019-01-31T05:48:29-07:00June 23rd, 2017|Geology|4 Comments

Archaean Eon: A volcano erupts out of the water The beginning of the Archaean Eon After the end of the Hadean Eon is the beginning of the Archaean Eon. That's about 3.8 billion years ago. Earth was still about three times as hot as it is today. But it was no longer hot enough to [...]