Sentences with phrase «sun was faint»

Over 3 billion years ago, the sun was faint so our planet should have been a snowball.

«For the longest time, people have been thinking the atmospheric pressure might have been higher back then, because the sun was fainter,» said lead author Sanjoy Som, who did the work as part of his UW doctorate in Earth and space sciences.

Barnes, that's because the Sun was fainter in those past epochs.

It takes less greenhouse effect to keep out of the Snowball now than it did when the Sun was fainter, but the threshold for initiatiing a Snowball in modern conditions is disconcertingly close to the value of p -LCB- rad -RCB- which reproduces the present climate.

Not exact matches

When the sun rose, God prepared a harsh, east wind and the sun attacked Jonah's head and he became faint and begged with all his life to die, saying, «Death is better to me than life.»

The sun was very strong and many of us fainted, collapsing one after another.

Sometimes, it's when we are up early and rolling through villages that are still half a sleep, the sun just starting to shine through the windows and a faint smell of coffee in the air.

In our solar system, for instance, Earth is 10 billion times fainter than the sun in terms of visible light.

17 / P Holmes was a run - of - the - mill comet in 2007, a faint fuzz ball hardly worth observing since it never got closer to the Sun than twice Earth's distance.

They weren't, and this «faint young sun paradox» has puzzled scientists for decades.

SOME 2.5 billion years ago, the sun was so faint the oceans should have been ice.

«As for exoplanets we want to broaden the search and study planets around stars that are cooler and fainter than our own Sun.

By carefully observing distant supernovae — stellar explosions that for a brief time shine as brightly as 10 billion suns — astronomers found that they were fainter than expected.

(At the time, the sun was as much as 6 % fainter than it is now, Lenton says, so the planet - warming effect of greenhouse gases wasn't as strong.)

Indeed, in the 1990s astronomers discovered the planet shown here; it's more massive than Jupiter and orbits the fainter yellow sun.

They are nearly impossible to see relying on visible light, but with the infrared vision of NASA's WISE space telescope, researchers finally detected the faint glow of six Y dwarfs relatively close to our sun, within a distance of about 40 light - years.

Total solar eclipses occur when the dark silhouette of the moon completely obscures the bright light of the sun, allowing the much fainter solar corona to be visible.

«Earth's hydrosphere, if it even existed at the Hadean time, may have been frozen all the way down, which would have all but eliminated tidal dissipation or friction,» Zhong said, adding that a weaker, fainter young Sun could have made such conditions possible in theory.

Similar ideas have also addressed the possibility of a fainter young Sun, but direct observational evidence in the geological record is currently lacking, making it the subject of debate among scientists.

One is that it is in the form of brown dwarfs, very faint stars made of the same kind of baryonic material as our Sun.

It lies at a distance of 280,000 light years from the Sun, and such a remote galaxy with faint brightness has not been identified in previous surveys.

But a few billion years ago a slightly fainter sun might have allowed for a relatively cool Venus, one where liquid water could have pooled in vast oceans that were friendly to life.

The faint light from the corona is usually overpowered by intense emissions from the Sun itself.

Studies of other stars, as well as theoretical modeling, have shown that Sun - like stars begin their life about 20 to 30 percent fainter in visible wavelengths than the Sun is at present.

According to the accepted view, the formation of the Earth released vast amounts of water vapour and carbon dioxide, which formed a thick atmosphere and caused strong greenhouse warming at a time when the Sun was 15 to 20 per cent fainter than today.

When the Sun was much fainter, the Earth with its present atmospheric composition would have been frozen solid.

The fact that they found none heavier than 18 times the Sun's mass suggests these heavier stars may not produce supernovae, or that they only produce very faint ones that are too dim to detect, the team says.

Prabal and his team modelled cases where the planets are in orbit close to small red dwarf stars, much fainter than our Sun, but by far the most common type of star in the Galaxy.

And at the root of all this tangled physics is the place where the corona starts, right above the sun's surface — the faint ring made visible during an eclipse.

«We focused on red - dwarf stars, which are smaller and fainter than our Sun, since we expect any biomarker signals from planets orbiting such stars to be easier to detect.»

The sun is directly behind the planet — an alignment not visible from Earth — which allowed astronomers to discover two faint outer hoops, never before seen, and to observe in unprecedented detail the microscopic particles that make up the rings.

All of the thousands of brown dwarfs found so far are relatively close to the Sun, the overwhelming majority within 1500 light years, simply because these objects are faint and therefore difficult to observe.

Climate models suggest that our planet should have been frozen over at the time, yet there is geological evidence for liquid water aplenty — a disparity that planetary scientists have dubbed the faint young sun paradox.

Within that range of atmospheric density, even higher concentrations of carbon dioxide wouldn't have been adequate to counteract the faint young sun, suggesting that methane, ethane or other strong greenhouse gases kept Earth from freezing.

As the Moon completely covers the Sun and perfectly blocks its light during an eclipse, the typically faint corona is easily seen against the dark sky.

Segue 2, discovered in 2009 as part of the massive Sloan Digital Sky Survey, is one of the faintest known galaxies, with light output just 900 times that of the sun.

With a visual luminosity that has reportedly varied between 0.000053 and 0.00012 of Sol's (based on a distance of 4.22 light - years) the star is as much as 19,000 times fainter than the Sun, and so if it was placed at the location of our Sun from Earth, the disk of the star would barely be visible.

It was originally detected by its gravitational attraction on the larger, brighter star and only later observed visually as a faint object (now called Sirius B), about 10,000 times fainter than Sirius (now called Sirius A) or 500 times fainter than the Sun.

These stars are either much brighter than the Sun, or much fainter.

When considered among the individual brightest stars in the sky (excluding the Sun), Alpha Centauri A is the fourth brightest at an apparent visual magnitude of +0.01, being fractionally fainter than Arcturus at an apparent visual magnitude of − 0.04.

The Sun seen from a distance of 50 light years would be a magnitude 5.8 star, so it also would be a faint point of light barely visible with the naked eye.

Red dwarfs are stars that are fainter, cooler and less massive than the sun.

A wildcard in the planned launch of New Horizons surrounds the radioisotope thermoelectric generator used to power the probe in the deepest extent of the solar system where the Sun is 1,000 times fainter than here on Earth.

But generally, despite this fainter sun, the climate had, outside of these chilly glitches, been warm, warmer than it ought to have been.

Viewed from another star, our Earth's reflected light would be 10 billion times fainter than the Sun itself, with an orbit that separates the Earth from the Sun by a tiny fraction of an arcsecond.

Since our Sun is many billions of times brighter than the faint objects ALMA typically observes, the solar commissioning team had to developed special procedures to enable ALMA to safely image the Sun.

Both Sedna and 2012 VP113 were found near their closest approach to the Sun, but they both have orbits that go out to hundreds of AU, at which point they would be too faint to discover.

A coronagraph is a telescope that is designed to block light coming from the solar disk, in order to see the extremely faint emission from the region around the sun, called the corona.

We expect to see faint, straight structures protruding from the north and south poles of the Sun — these are the polar plumes.

Forgive the faint blurriness... it was dusk, the sun was setting, husband was the photographer.