What is halley comet made of?
Haley’s comet is an immense chunk of ice and rocks. It follows its own orbit around and through the solar system, which comes by earth every 76 years. Famous author Mark Twain was born, and passed away on a Haley’s comet year.You can find more information here: http://www.schechter.org/sager/Links/second/2nd_grade_outer_space_unit/Haleys_Comet.