meadow foxtail: stout erect perennial grass of northern parts of Old World having silky flowering spikes; widely cultivated for pasture and hay; naturalized in North America
plant: (botany) a living organism lacking the power of locomotion
heliopause: the boundary marking the edge of the sun's influence; the boundary (roughly 100 AU from the sun) between the interplanetary medium and the interstellar medium; where the solar wind from the sun and the radiation from other stars meet