When Earth and Mars are at their theoretically closest point of 54.6 million km, it would take a signal from Earth about 3 minutes to make the journey, and then another 3 minutes for the signals to get back to Earth.
Switchgrass is a hardy, deep-rooted, perennial rhizomatous grass that begins growth in late spring. It can grow up to 2.7 m high, but is typically shorter than big bluestem grass or indiangrass. The leaves are 30â90 cm long, with a prominent midrib.
Turfgrass State Specialist. Division of Plant Sciences. Buffalograss (BuchloÃ« dactyloides) is the only grass native to North America that is used widely for turfgrass. Fossils discovered in Kansas show that buffalograss existed in that region at least 7 million years ago. It was the principal forage grass for the American bison, hence the name.