In Universe there are trillions of planets, are we home alone?

 Once seen as the center of the universe, the Earth has faced devastation in many places over the past few hundred years. Now, in this era of fast-paced discovery, we come to know that we are one of just one-billion planets in the Milky Way galaxy - and among the small ones at that.

Yet the Earth remains an impasse, and until now, a type. Among the thousands of exoplanets surrounding other Stars - confirmed by our increasingly powerful telescopes, and despite extensive investigation of the solar system, ours is still the only planet known to host life.

In some way it is an embarrassment of wealth. Earth's abundant, sustained, and comprehensive life-experience seems to fill almost every nook and cranes, from the Antarctic pools of Yellowstone National Park to the dry Valleys of Antarctic. In geological time, an iblink - a rotating disk of gas and dust could start life well only a few hundred million years after Earth was formed.

PLANET EARTH THROUGH THE AGES 

But the Earth does not always look like the blue orb that we know well. a wide variety of organisms that have come and gone over billions of years, in a sense, paints a picture of many Planets: Earth as a lava-covered rock with a poisonous atmosphere, an ocean world with a bare beginning of microscopic life, Dinosaurs shaking the Earth, or a volatile tropical riot of an ice age where cave dwellers hunted giant birds.

We talk about Earth like planets like today's planet,'' said program scientist Doug Hudgins of NASA's exoplanet exploration program at NASA's headquarters in Washington. '' The planet has been fundamentally different many times in the past.''

( 3.8 to 2.5 billion year ago during the archean era, atmospheric haze might have made earth pale orange instead of pale blue -

A have possibly caused by micro-organisms. )

( 630 million year ago the planet might have been almost completely covered in ice, though perhaps with slushy oceanic opening near the equator. )

( 252 to 66 million year ago even after the continents and ocean took on a more modern look, their shapes were very different in earlier epochs. )

( 2.6 million to 11,700 year ago by the onset of the most recent ice age during the Pleistocene era the continents head, for the most part, assumed their present shapes and positions, but large part of the surface were covered in glacial ice. )

( 11,700 year ago to now the holocene era has seen the expansion of human civilization across the planet, and the rise of advanced technology. )

Comparison of Earth's vibrant past to the universe stretching endlessly in all directions, still silent on the question of life. Not even a crickets.

So, are we really alone in the hole universe?

Finding an answer is a high priority for NASA, but even the question - which interrogating the universe - quickly becomes a list of materials from astronomy: chemistry, planetary science and cosmology, strongly seasoned with figures/statistics.

SEARCHING AND DISCOVERING OF LIFE: WHAT WE KNOW AND DON'T KNOW

The odds seem to be slightly better now that we have confirmed more than 4,000 exoplanets in our galaxy, about a fifth of them in the Earth's size range. We know that the building blocks of life exist throughout the solar system and the universe, and include water.

We do not know that how easily life starts or begins, whether it is common or rare, how long it lasts. From ancestors to intelligent life and questions only multiply.

This includes one of the famous questions of all: Where is everyone? Physicist Enrico Fermi introduced it back in 1950 during a lunch with fellow physicist, ignoring decades of debate. At leisurely, even at a slower than light pace, the argument went, our galaxy can be easily traversed by a space civilization within a  few million years. Our Milky Way galaxy is currently moving 14 billion. And while it took 4 billion plus years for technological intelligence to develop on our planet, the system of planets of comparable age in  the galaxy as well as others are much older.

We hope you will join NASA for a journey beyond our solar system and planet and stars. Through stories and visuals, they take stocks of where the search for life stands and glimpse the future - space telescopes, instruments, probes, landers rovers, and advanced technology NASA plans to deploy in the coming decades. The goals is to find hidden blue and white marble, or perhaps even an orange living breathing planet.

''We only have examples to follow our planet, which studies how plants can adapt to exoplanet environment,'' said Nancy Kiang of NASA's goddard institute for space studies. A similar evolutionary path (otherworldly) but may - convergent evolution on a planetary scale.''

It may not be quite like looking in the mirror, but not far from looking like home.

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