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.
(extremely noxious weed - Elytrigia repens) Quackgrass (also known as: couch, quitch, devils, wheat, scutch, twitch, witch, dog or durfa grass) are undesirable perennial grasses that grow as weeds in many lawns. Unfortunately there is no herbicide you can use that will not also kill the desirable lawn grasses.