• Scientists believe that we can only see about 5 percent of the matter in the universe. The rest is made up of invisible matter, called dark matter, and a mysterious form of energy known as dark energy.
• Neutron stars are so dense that a soup can full of neutron star material would have more mass than the moon.
• The sun produces so much energy that every second, the core releases the equivalent of 100 billion nuclear bombs.
• Galileo Galilei is often incorrectly credited with the invention of the telescope. Instead, historians now believe the Dutch eyeglass maker Johannes Lippershey as its creator. Galileo was, however, probably the first to use the device to study the heavens.
