Learning when to talk and when to be quiet is sometimes essential - in June, NASA will cease contact with its 5 orbiters and rovers on Mars, due to the red planet moving behind the Sun for weeks. Any commands sent during this time may endanger the entire mission.
Knowing when not to visit a remote area involves assessing environmental tolls, listening carefully to rangers and obeying park rules. Here's how to preserve the places you visit at Joshua Tree National Park's Cadiz Valley, the Mojave Desert and beyond.