› added 4 years ago

113

TIL Refracting telescopes use the original telescope design by Galileo, with two lenses in a hollow tube. They can provide a crystal clear image for observing close celestial objects like moon and planets but not good for for deep sky objects, unlike reflector telescopes

Read more telescopeguides.com

via reddit.com

78Vbx TIL that every local field is isomorphic to R, C , a finite extension of Q_p , or a finite extension of the field of Laurent series over F_p
e0njJ TIL that Dolphins can stay awake for 15 days by sleeping with one half of brain
7r0nP TIL that the word deer used to refer to all types of animals. This is why languages such as German and Dutch still use the words 'Tier' and 'dier' respectively.
QJMlp TIL of the “Coffin Torpedo”—a small shotgun secured inside the lid of a coffin to “prevent the unauthorized resurrection of the dead.” The shotgun fired lead balls at whoever pried the lid open and were used as an experimental deterrent to the rising tide of body snatchers in the late 1800s.
n6d7 TIL Heart disease is the leading cause of death in male Western lowland gorillas in North American Zoos. To combat this Cleveland Metropark Zoo doubled the gorilla’s leafy green intake which lead to a 65 pound weight loss in the gorillas.