Nahian Shuvo: February 2016

একটি পুরাতন সম্পর্ককে অনেক দূরে সরিয়ে দেয়, নতুন একটি সম্পর্ক, আজকে যে সম্পর্ক অনেক গুরুত্বপূর্ণ কাল তা এতোটা গুরুত্বপুর্ণ নাও থাকতে পারে নতুন একটি সম্পর্কের আবির্ভাবে, অনেকদিনের পুরানো বন্ধুত্ব বা ভালবাসা, বা অনেক মধুর সম্পর্ক,,,তা নিমিষেই ভেংজ্ঞে দেয় নতুন আরেকটি সম্পর্ক,,,, অনেক ভাল বন্ধু দূরে সরে যেতে পারে নতুন একটি সম্পর্কের কারনে, আবার অনেক ভাল সম্পর্ক দূরে সরে যেতে পারে নতুন একটি বন্ধুত্বের কারনে। দুটাই সম্পর্ক কিন্তু তফাৎ একজায়গায় তা হল.............। থাক নাই বা বললাম পারলে বুঝে নিন

new planet like earth
NASA Finds Closest Earth Twin Yet in Haul of
500 Alien Planets
by Mike Wall, Space.com Senior Writer
Date: 23 July 2015 Time: 12:00 PM ET
This artist's illustration depicts what the
exoplanet Kepler-452b, an Earth-size world
orbiting a star like Earth's sun, may appear.
NASA's Kepler Space Telescope detected the
planet, which appears to be a bigger, older
cousin of Earth.
CREDIT: NASA Ames/JPL-Caltech/T. Pyle
It may not be Earth's exact twin, but it's a pretty
close cousin.
NASA's Kepler space telescope has spotted the
most Earth-like alien planet yet discovered — a
world called Kepler-452b that's just slightly
bigger than our own and orbits a sunlike star at
about the same distance Earth circles the sun.
"This is the first possibly rocky, habitable planet
around a solar-type star," Jeff Coughlin, Kepler
research scientist at the Search for
Extraterrestrial Intelligence (SETI) Institute in
Mountain View, California, said during a news
briefing today (July 23). [Exoplanet Kepler 452b:
Closest Earth Twin in Pictures
]
"We've gotten closer and closer to finding a true
twin like the Earth," Coughlin added. "We haven't
found it yet, but every step is important because
it shows we're getting closer and closer. And
this current planet, 452b, is really the closest
yet."
Scientists have discovered other small,
potentially habitable exoplanets, but those
previous finds orbited red dwarfs, stars much
smaller and cooler than the sun.
Meet Kepler-452b, Earth's closest twin
An Artist's concept of the surface of the
newfound exoplanet Kepler-452b, a planet about
60 percent wider than Earth that lies 1,400 light-
years away. Kepler-452b is likely rocky, and it
orbits its sunlike star at the same distance Earth
orbits the sun.
Credit: SETI Institute/Danielle Futselaar
The mission of the Kepler Space Telescope is to
identify and characterize Earth-size planets in
the habitable zones of nearby stars. [See how
NASA's planet-hunting Kepler spacecraft works
in this Space.com infographic
]
Credit: Karl Tate, SPACE.com contributor
Kepler-452b lies 1,400 light-years away, and is
the only planet known in its solar system. It's
about 60 percent wider than Earth, which gives it
a "better than even" chance of being rocky,
researchers said. The planet is probably about
five times more massive than our own, making it
a so-called "super Earth." It likely possesses a
thick atmosphere, lots of water and active
volcanoes.
The exoplanet completes one orbit every 385
days, so its year is only slightly longer than
Earth's. And Kepler-452b circles a sunlike star
that's just 10 percent bigger and 20 percent
brighter than the one that hangs in Earth's sky.
"It would feel a lot like home, from the
standpoint of the sunshine that you would
experience," said Jon Jenkins, Kepler data
analysis lead at NASA’s Ames Research Center
in Moffett Field, California. (Jenkins led the team
that discovered Kepler-452b.)
But Kepler-452b's star appears to be
considerably older than the sun — 6 billion years,
compared to 4.5 billion years.
"It’s awe-inspiring to consider that this planet
has spent 6 billion years in the habitable zone of
its star; longer than Earth," Jenkins said in a
statement , referring to that just-right range of
distances that could support the existence of
liquid water on a world's surface. "That’s
substantial opportunity for life to arise, should all
the necessary ingredients and conditions for life
exist on this planet."
Kepler-452b's existence was announced with the
release of the latest Kepler catalog, which
includes 521 new planet "candidates" dug out of
the data the spacecraft gathered during its first
four years of operation. (Kepler, which launched
in March 2009, stopped observing under its
original planet-hunting mission in May 2013, after
the second of its four orientation-maintaining
reaction wheels failed.)
Eleven of the 521 newfound candidates are, like
Kepler-452b, less than twice as wide as Earth
and reside in their host stars' habitable zone ,
researchers said.
Kepler's total haul of potential exoplanets is now
nearly 4,700. Just 1,030 of these finds have been
confirmed to date, but mission scientists expect
that the vast majority — 90 percent or so — will
end up being the real deal, just like Kepler-452b.
During its original mission, Kepler stared at more
than 150,000 stars simultaneously, looking for
tiny brightness dips caused by planets crossing
these stars' faces. Kepler's dataset is therefore
huge, and it has taken researchers a while to
analyze it and address the main goal of the $600
million mission — determining how common
Earth-like planets are across the Milky Way
galaxy .
Analyses of Kepler observations to date suggest
that about 20 percent of the Milky Way's stars
harbor at least one rocky planet in the habitable
zone, but this number will be revised or refined
with additional study, researchers said.
"Continued investigation of the other candidates
in this catalog and one final run of the Kepler
science pipeline will help us find the smallest
and coolest planets," the SETI Institute's Joseph
Twicken, lead scientific programmer for the
Kepler mission, said in a different statement .
"Doing so will allow us to better gauge the
prevalence of habitable worlds."
Indeed, the team plans to release the eighth
Kepler catalog next year. Continued software
improvements and the knowledge gained during
previous analyses of the dataset should lead to
more exciting finds by the mission science team
— and by researchers who study the publicly
archived data in the future, Coughlin said.
"I really expect that discoveries will be coming
from Kepler for the next several decades," he
said.
The exoplanet Kepler-452b circles its
parent star in an orbit very much like that of the
Earth around the sun, as seen in this NASA
diagram. Kepler-452b takes 385 to orbit its star,
and is in the habitable zone where liquid water
could exist, making it a close Earth cousin.
Credit: NASA/JPL-CalTech/R. Hurt
Kepler: NASA's prolific planet hunter
Kepler's original observations required
tremendously precise pointing — an ability the
telescope lost with the second reaction-wheel
failure in May 2013.
But Kepler isn't done observing the heavens. In
May 2014, NASA approved a new mission called
K2 , in which the spacecraft is studying a variety
of cosmic objects and phenomena, including
distant supernova explosions, comets and
asteroids in our own solar system and
exoplanets. And a compromised Kepler can
indeed still spot alien worlds: NASA announced
the K2 mission's first exoplanet find in December
2014.
The first exoplanet was spotted in 1992, and
researchers have discovered nearly 2,000
confirmed alien worlds in the 23 years since then
(the exact number varies depending on which
database is consulted). The Kepler spacecraft is

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Kepler 452B

responsible for more than half of these finds.

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