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High Planetary Tilt Lowers Odds for Life?
Topic: Alien Life
Highly-tilted worlds would have extreme seasons, subjecting life to alternating periods of scorching and subzero temperatures. This could make the development of all but hardiest, simplest creatures a long shot.

Loss of Planetary Tilt Could Doom Alien Life
Topic: Alien Life
Gravitational interactions between red dwarf stars and habitable planets could erase a world's axial tilt, which moderates global temperatures and creates seasons, before life gets a chance to develop.

Wanted: Habitable Moons
Topic: Alien Life
Rocky moons that orbit gas giant planet and reside in the habitable zone of their star could contain the seeds of life. Thanks to new research, finding those moons just got a little easier.

The Methane Habitable Zone
Topic: Alien Life
In the search for life elsewhere, many studies focus on finding liquid water. But what if life could exist with some other solvent? SaturnĀ“s smoggy moon Titan makes scientists question the possibilities for methane-based life in the galaxy.

Looking for the Bright City Lights of ET Life
Topic: Alien Life
Researchers suggest that alien civilizations could be detected by the city lights that illuminate the dark nights on distant worlds.

An Alien Code Close to Home: Seeking ET Beyond the Radio Silence
Topic: Alien Life
The search for intelligent alien life goes beyond SETI's search for intergalactic radio signals. Some scientists are looking for evidence of technological footprints and biological clues embedded in the DNA of life on Earth.

Living in the Galactic Danger Zone
Topic: Alien Life
Although stars closer to the galactic center are exposed to more radiation, new research finds that there are more chances to find habitable planets there than in the outer regions of our galaxy.

Alien Life More Likely on 'Dune' Planets
Topic: Alien Life
A new study finds that desert worlds -- like the planet Arrakis in the sci-fi classic "Dune" -- might be the more common type of habitable planet in the galaxy, rather than watery planets such as Earth.

Dolphins, Aliens, and the Search for Intelligent Life
Topic: Alien Life
While SETI scans the galaxy for evidence of advanced alien civilizations, what can studying dolphins teach us about non-human intelligence?

Greenhouse Effect Could Extend Habitable Zone
Topic: Alien Life
Astronomers generally expect planets with liquid water to exist close to their parent star. But new research shows that some planets orbiting at the same distance as Saturn could have lakes and oceans.
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