This article was originally published on The Conversation. Read the original article. Such views are increasingly attracting
"Life could spread from host star to host star in a pattern similar to the outbreak of an epidemic."
It's possible that billions of years ago, tiny bits of biology quit the Red Planet and infected ours. If so, your family tree -- and that of every other terrestrial life form -- has its deepest roots not in the ancient oceans of Earth, but in the vanished seas of Mars.
In contrast to what Crick-Orgel speculated about in 1973, four decades later, a team of scientists, led by astronomer-astrobiologist
A two-month rain storm in southern India may be the most compelling evidence yet that extraterrestrial lifeforms have visited
"Certain conditions were a sweet spot for complexity," Goldman told LiveScience. When the Earth was young, comet bombardments
Sharov and Gordon's idea raises other intriguing possibilities. For one, "life before earth" debunks the long-held science
When the red rain arrived in 2001, it caught everyone off guard. Now, even after a decade, its implications are debated in scientific circles. Some researchers suggest this phenomenon is a mark of alien life form.
The greenhouse effect and climate change have been front-page, headline-grabbing stuff for decades now. But scientists have been studying the phenomenon for more than a century, Arrhenius included.