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.
Barnyardgrass (Echinochloa crusgalli) is a summer annual that propagates by seed. Like most annual grasses, it grows in clumps by rooting and branching at the lower joints (nodes) of the stems. Seedlings often have a reddish base.