Who was Edmund Halley?
a scientist
Of what nationality?
English
How long ago did he live?
more than 200 years ago
What did he study?
comets
What could he not figure out?
the orbit of a particular comet
Who was Halley's friend?
Isaac Newton
Who was he?
a methematician
What years did the comet appear?
1531, 1607 and 1682
Did they all have the same orbit?
yes
How many years apart were they?
75 t o76
What did Halley predict?
the comet would come back
In what year?
1758
Did the comet appear?
yes
Was he alive to see it?
no
What was the name of the comet?
Halley's comet
How many years did it take for the comet to come back?
76 years
Did other scientists try to figure it out?
yes
Were they successful?
no
What shape did the comet's orbit have?
ellipse
Who figured that out?
Newton