Milky Way Crossword
This printable crossword puzzle on the topic of Astronomy & Space has 12 clues. Answers range from 4 to 13 letters long. This crossword is also available to download as a Microsoft Word document or a PDF.
Description
What can be used to estimate the total number of intelligent civilizations in our Galaxy, although a number of its factors are extremely uncertain?
What is evolution of primal energy into elementary particles?
What is the evolution of atoms into galaxies and stars?
What is the evolution of stars into heavy elements?
What is the evolution of elements into solid, evolution rocky planets?
What is the evolution of those same elements into the molecular building blocks of life?
What is molecules into life itself?
What is advanced life forms into intelligence, culture, and technological civilization?
Dividing the population of the Milky Way by its present age gives you the rate of what?
How many phases are in the cosmic evolution?
Any two-way communication will take about how many years?
What type of radio signal is used as another way to communicate with the outside world?
