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.
Creeping Bentgrass. Creeping bentgrass (Agrostis palustris) is a thin-bladed cool season perennial grass that is quite invasive. It spreads into areas of more desirable bluegrass, choking them out. Bentgrass is occasionally used as a lawn grass in states with milder, moister climates, but rarely in cool season areas.reeping bentgrass (Agrostis palustris) is a thin-bladed cool season perennial grass that is quite invasive.