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.
Ryegrass is a bunch grass that was brought to the United States from Europe; it is not to be confused with the plant that produces the rye grain that is used to make rye bread and whiskey. Ryegrasses are known for their ability to grow in cool weather. Perennial ryegrass is used for lawns, turf, and pasture.