1)
in 1610, shortly after viewing the sun with his new telescope, galileo galilei made the first european observations of sunspots and continuous daily observations were started at the zurich observatory in 1849. the graph represents the sunspot count over the last 15.5 decades. the numbers you see within the graph itself is the counted decade, so this dat ahas been recorded for 24 decades. based on the sunspot tallies, what comment can you make about their occurrence?
a) sunspot numbers rise and fall cyclically.
b) the number of sunspots remains constant over time.
c) sunspot numbers reach their peak every five years.
d) the number of sunspots has been declining over the decades.