• What is inflation?
  Inflation was a period in the first few trillionths of a trillionth ...

• Can we see the Big Bang?
  Astronomers can see the galaxies hurtling away in all directions. ...

• How did the first galaxies and stars form?
  They formed from curdled lumps of clouds of hydrogen and ...

• What is life made of?
  Life is based on complex compounds of the element carbon, known as ...

• Where did the materials of life come from?
  It used to be thought that organic chemicals all originated on Earth, ...

• Where did life come from?
  Most scientists think life on Earth began on Earth-in the oceans or ...

• What is SETI?
  SETI is the Search for Extra-Terrestrial Intelligence ...

• Why is the universe like it is?
  The amazing chance that life exists on Earth has made some scientists ...

• What is DNA?
  Dioxyribonucleic acid, the most remarkable chemical in the universe ...

• How are we looking for extra-terrestrial life?
  Since possible fossils of microscopic life were found in Martian rock ...