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.
Wheatgrass is the young grass of the wheat plant, Triticum aestivum. It grows in temperate regions throughout Europe and the United States and can live indoors or outdoors. Many people grow their own wheatgrass by putting wheat seeds in water and then harvesting the leaves.