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.
One of our favorite grasses, switchgrass offers airy plumes in late summer and fall. It looks great during the season, too: Many varieties (such as 'Dallas Blues') offer blue-gray foliage during the season and turn brilliant shades of gold or red in autumn.