why earth is only planet with life?
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6 THINGS THAT MAKE LIFE ON EARTH POSSIBLE
Earth is well equipped as a planet and ideally placed in our solar system and galaxy to support life as we know it. The product of some 4.6 billion years of cosmic construction, our planet is flush with life thanks to a fortuitous set of conditions.
OUR LOCATION IS FAR FROM MANY HAZARDS
The solar system is comfortably nestled in a safe harbor
between major spiral arms, and its nearly circular orbit helps
it avoid the galaxy’s perilous inner regions. There are
relatively few stars near the sun, reducing risks to Earth
from gravitational tugs, gamma-ray bursts, or collapsing
stars called supernovae.
OUR SUN IS A STABLE AND LONG- LASTING STAR
Stars more massive than the sun burn hotter and usually
don’t live long enough for planets to develop life. Less
massive, younger stars are often unstable and are prone to
blasting their planets with bursts of radiation.
WE’RE AT JUST THE RIGHT DISTANCE FROM THE SUN
Earth orbits in the so-called Goldilocks zone, where the planet
receives enough energy to allow water to exist as a liquid
on its surface. Too far, and the vital compound stays locked
up as ice. Too close, and the water would rapidly
evaporate into the atmosphere.
WE HAVE THE RIGHT STUFF TO HOST A DYNAMIC CORE
The interstellar cloud of gas and dust that gave rise to
Earth contained enough radioactive elements to power a
churning core for billions of years. This creates a magnetic
field that protects the planet from dangers like solar flares.
WE HAVE A BIG MOON TO STABILIZE OUR AXIAL WOBBLE
Earth is tilted with respect to the sun, and teeters as it spins.
This tiny wobble can shift the climate from hot to icy every
41,000 years—and might vary more without the moon’s stabilizing pull.
WE HAVE AN OZONE LAYER TO BLOCK HARMFUL RAYS
Ancient plantlike organisms in the oceans added oxygen to the
atmosphere and created a high-altitude layer of ozone that
shielded early land species from lethal radiation.
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