A region of nearly pure silica on Mars hints at the ancient existence of water, according to a study published in the May 23 Science. The Mars rover Spirit found the silica – the main component in sand on Earth – in the
Note: To comment, Science News subscribing members must now establish a separate login relationship with Disqus. Click the Disqus icon below, enter your e-mail and click “forgot password” to reset your password. You may also log into Disqus using Facebook, Twitter or Google.