The Synthesis of "earth's twin"

Discover Venus, Earth's sister planet. Learn why this world of extreme heat and pressure captivates scientists and fuels new space missions.

Discover super-earths, exoplanets larger than our world but smaller than Neptune. Learn why these planets are key in the search for alien life.

Discover Earth, the third planet from the Sun and the only astronomical object known to harbor life. Learn what makes our vibrant world so unique.

Discover Titan, Saturn's largest moon. With a thick atmosphere and liquid lakes, it's a prime target in the search for life beyond Earth.

Discover axial tilt, the angle of a planet's rotational axis. Learn why Earth's 23.5-degree tilt is the crucial reason we experience seasons.

Discover Proxima Centauri b, the closest exoplanet to our solar system. Learn why this rocky world, orbiting in its star's habitable zone, excites scientists.

# Top 10 Most Incredible Space Discoveries The universe is a vast and bewildering expanse, a cosmic ocean of which we have explored but a single, tin...