An even bigger prize awaits, however:
a planet with the size and temperature of our own.
The field of exoplanets is hotter than ever: we learned that planets are literally everywhere and
that planets with sizes similar to Earth are the most common among the known planets.
At least to me, it appears that the current, huge scale (6.6 billion people) and projected growth (to 9.2 billion people by 2050) of the human family could reach a point in history when the human species becomes unsustainable on
a planet with the size and make - up of Earth.
Our generation of elders appears to be doing a woefully inadequate job of helping our children understand that the current, relentless, business - as - usual effort to grow the global economy, given the gigantic scale and anticipated growth rate of the economic globalization, could soon become patently unsustainable on a small, finite
planet with the size and make - up of Earth.
The current scale and rapid growth rate of the global economy can not be sustained much longer, much less forever, on
a planet with the size and make - up of Earth.
It seems to me that if we keep engaging in and hotly pursuing worldwide overproduction, overconsumption and overpopulation activities, distinctly human activities that can not be sustained much longer on
a planet with size, compostion and ecology of Earth, then the human species is a clear and present danger on our watch to future human well being, life as we know it, and environmental health.
A finite
planet with the size, composition and environs of the Earth and a community with the boundaries, limited resources and wondrous climate of villages, towns and cities where we live may not be able to sustain much longer the economic and population growth that is occurring on our watch.
Not exact matches
DeGrasse Tyson's argument has to do
with the fact that he doesn't believe that Pluto's
size is qualified for
planet status, even though NASA has announced that the dwarf
planet is slightly larger than they thought.
At CMIT Solutions, we're committed to serving clients in the small to medium -
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At least seven immense, interdependent threats to the quality of life on spaceship earth continue to escalate: the population explosion; the widening gulf between rich and poor nations; massive malnutrition (caused mainly by economic injustice, which produces maldistribution of available food); environmental pollution and degradation; the depletion of the irreplaceable resources of our finite
planet; the growing threat of nuclear terrorism and eventual holocaust (
with the equivalent of one and a half million Hiroshima -
sized bombs in the arsenals of the world); and the worldwide tendency for the fruits of science and technology to be used without ethical responsibility.
While some may balk at the idea of getting into bed
with a corporate partner of such
size, and one whose fortunes depend on people eating meat, Memphis Meats explained that the move would «help us advance clean meat and achieve our ultimate vision: a world that is better for humans, animals and the
planet.»
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I think there are more important things to work on
with our child than trying to save the
planet from his
size 3 diapers.
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Many space enthusiasts got their hopes up earlier this year when scientists discovered TRAPPIST - 1, a star
with a collection of seven Earth -
sized planets — three of which were in the star's habitable zone and could house life - sustaining liquid water.
If too many particles in this
size range were lost, there wouldn't be enough remaining to collide
with each other and accumulate into planetesimals and, eventually,
planets.
With much the same
size, mass and composition as our home, Venus was a lush jungle
planet in the popular imagination of the early 20th century.
«This deployment of technical means allowed us to reconstruct
with a very high precision the shape and
size of dwarf
planet Haumea, and discover to our surprise that it is considerably bigger and less reflecting than was previously believed.
Coupled
with software to reduce assorted stellar background noise, it could measure light changes down to 20 parts per million, making it more than sensitive enough to detect an Earth -
size planet around a sunlike star in an orbit as large as Earth's.
That's because such a feat would require gravitational interactions
with a
planet the
size of Saturn or larger, something present in only about 10 % of single - star solar systems near us in the Milky Way.
The researchers then calculated the
planets»
sizes — between one and four times the Earth —
with about four times greater precision than in previous studies.
On the upside, Kepler researchers have discovered four other potential Earth -
size planets with palatable temperatures.
Brown and Batygin's discovery of evidence that the Sun is orbited by an as - yet - unseen
planet that is about 10 times the
size of Earth
with an orbit that is about 20 times farther from the Sun on average than Neptune's changes the physics.
Combining these new estimates
with the fact that there are even larger impact basins on the Moon and other
planets, Schultz concludes that protoplanet -
sized asteroids may have been common in the early solar system.
That means Earth -
size planets could be found all over the galaxy instead of just round stars
with plentiful supplies of «metals», elements heavier than helium.
Stars
with a metal content as low as a quarter of the sun's can host
planets between one and four times the
size of Earth, the team found (Nature, DOI: 10.1038 / nature11121).
This time they said we needed to show that even in orbit, where it is dealing
with cosmic rays and other noise, the telescope would be sensitive enough to detect Earth -
size planets.
As the
size of the
planets we looked for decreased, the number that we found increased: We found more
planets with 3 times the mass of the Earth than
planets with 10 times Earth's mass, more
planets 10 times as massive than 100 times, and so on.
This makes TRAPPIST - 1 the planetary system
with the largest number of Earth -
sized planets discovered so far.
Once confirmed, a transit allows astronomers to confidently measure a
planet's orbital period — its year — as well as to estimate its
size, by comparing the depth of its shadow
with the estimated dimensions and luminosity of its star.
The
planet was the first astronomers found
with a
size similar to Earth's.
That's when mission planners project radio communications will be lost
with the two - ton, bus -
size spacecraft as it plunges into the giant
planet's turbulent atmosphere at more than 122,000 kilometers per hour.
This dwarf
planet should be pockmarked
with craters up to 500 miles across, but scientists haven't measured one even half that
size.
A group of scientists believe that a previously unexplained isotopic ratio from deep within Earth may be a signal from material from the time before Earth collided
with another
planet -
sized body, leading to the creation of the Moon.
The idea that a very disruptive collision of Earth
with another
planet -
sized body, the biggest event in Earth's geological history, did not completely melt and homogenize Earth challenges some of our notions on
planet formation and the energetics of giant impacts.
Mars therefore must be an embryo that for some reason stopped merging
with other embryos and failed to become a full -
size rocky
planet.
Even
with abundant carbon and nitrogen to consume, the
size of the plant and its limited access to fresh water make it almost inconceivable that it could even survive in the Arctic, let alone muster up enough power and mass to change the Earth's entire climate, saving our
planet, perhaps, from a Venus - like, overheated oblivion.
Meléndez identified 15 elements that are more abundant in sun -
size stars
with giant
planets orbiting very close to the stars.
The destruction of Mercury's outer shell would have meant a collision
with another
planet of similar
size, the remains of which would have plunged into the sun.
Our solar system may have been born
with dozens of
planet -
size objects that Jupiter ejected into interstellar space.
Then in the mid-1970s, planetary scientist William K. Hartmann and a few others proposed that the moon was formed by the collision of a Mars -
size planet with the Earth.
Although both worlds are similar in
size and density, our planetary neighbor has temperatures so high they can melt lead, winds that whip around it some 60 times faster than the
planet itself rotates and an atmosphere that slams down
with more than 90 times the pressure found on Earth's atmosphere.
Images from the Hubble Space Telescope reveal a Jupiter -
sized planet, perhaps
with a surrounding dust disk, orbiting about 115 astronomical units from a nearby main sequence star.
Astronomers could yet discover another full - fledged
planet, maybe a Mars -
sized ball of ice orbiting way beyond Pluto, and sharing its orbit
with only much smaller snowballs.
These
planet -
size worlds are squashed and stretched by their gravitational interactions
with Jupiter and
with one another.
The glow seemed consistent
with the
size and shape of the matter needed to make ngc 5907 spin the way it does, so astronomers hoped that this might be the first sign that the dark halos were made of ordinary stars and
planets — albeit faint ones — rather than exotic, yet - to - be discovered particles.
PLANETARY LINEUP Seven Earth -
sized planets orbit the star TRAPPIST - 1
with short periods, from 1.5 to 20 Earth days.
The research will help astronomers determine which
planets discovered
with NASA's Kepler telescope — which has a primary mission of finding habitable
planets similar to Earth — are actually more analogous to Earth's similarly -
sized sister
planet.
A nearby ultracool star harbors seven Earth -
sized planets, three
with orbits that potentially put them in a habitable zone.
17 That's still nothing compared
with Jupiter's Great Red Spot, a seemingly eternal 400 - mile - per - hour hurricane nearly twice the
size of our entire
planet.