Open the source notes , and review the notes for all three sources:
. "Should We Terraform Mars?"
. "Mars"
. "Why Mars?"
Consider and record your thoughts about these concepts:
. one common idea among the texts
• one idea from the texts that differs
how the ideas better help you understand the topic and answer the question "Should humans travel to Mars?"

Match each excerpt to the correct stanza structure. 1. it was many and many a year ago, in a kingdom by the sea, that a maiden there lived whom you may know by the name of annabel lee; and this maiden she lived with no other thought than to love and be loved by me. (from "annabel lee" by edgar allan poe) 2. o thou, new-year, delaying long, delayest the sorrow in my blood, that longs to burst a frozen bud and flood a fresher throat with song. (from "in memoriam" by alfred lord tennyson) 3. nature’s first green is gold, her hardest hue to hold. her early leaf’s a flower but only so an hour. then leaf subsides to leaf. so eden sank to grief,; so dawn goes down to day. nothing gold can stay. (from "nothing gold can stay" by robert frost) 4. at sestos hero dwelt; hero the fair, whom young apollo courted for her hair, and offered as a dower his burning throne, where she should sit for men to gaze upon. the outside of her garments were of lawn, the lining purple silk, with gilt stars drawn; (from "hero and leander" by christopher marlowe) quatrain couplet octave sestet