The Doctor decided to answer Evelyn's first question as he stared at the fireflies' formation. "Time Lords' senses are more keen that humans. We're often able to detect atmospheric composition by scent and taste. It's not an exact thing, however. Not to mention," he added with a sly smile as he turned to glance at her. "We've been here at least fifteen minutes already. If it weren't Earth-like we'd have probably passed out by now."

Then his eyebrows raised as he heard her last words. "You say that as if you've left planet Earth before," he muttered softly, now staring at Evelyn curiously.