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.
Nutgrass is the common term for what a weed expert said is technically nutsedge. In California we have yellow nutsedge (Cyperus esculentus) and purple nutsedge (Cyperus rotundus), said Cheryl Wilen, area integrated pest management advisor for the University of California's pest management program.