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.
Green Needlegrass. A cool season, perennial bunch type grass that grows from 1 1/2 to 3 feet tall. It is a native grass that grows on medium to fine textured soils. Green Needlegrass starts growth early in the spring, and is nutritious, palatable, and remains green throughout the year.