Sentences with phrase «astronomers estimate»

Astronomers estimate that an interstellar asteroid similar to «Oumuamua passes through the inner solar system about once per year, but they are faint and hard to spot and have been missed until now.

Today there are more than a thousand known Kuiper Belt Objects (KBOs), and astronomers estimate that there may be more than 70,000 KBOs with diameters greater than 100 kilometers.

This greatly expands the number of locations where extraterrestrial life might be found, since liquid water is necessary to support known forms of life and astronomers estimate there are dozens of these worlds.

By measuring the shift of the frequency very precisely, astronomers estimate the speed and direction of moving gas.

Today there are more than a thousand known Kuiper belt objects (KBOs) and astronomers estimate that there may be more than 70,000 KBOs with diameters greater than 100 kilometres.

Now read: Astronomers estimate 100 billion habitable Earth - like planets in the Milky Way, 50 sextillion in the universe

When astronomers estimate stellar distances for objects that are relatively close to Earth, they use a method called parallax.

What's more, astronomers estimate that 500 million of these alien worlds are probably sitting inside the habitable zones of their parent stars.

So far, surveys have discovered several thousand near - Earth objects, but astronomers estimate that as many as a million have diameters greater than 50 metres, big enough to be dangerous in a collision with Earth (see UN urged to coordinate killer asteroid defences).

Astronomers estimate DG CVn was born about 30 million years ago, which makes it less than 0.7 percent the age of the solar system.

The massive space rock — the first object to score above zero on the Torino hazard scale, which ranks the danger of an extraterrestrial impact — has about 1 chance in 500 of colliding with Earth in 2030, astronomers estimate.

Astronomers estimate it is between 13 and 34 kilometres across.

Small asteroids are much more numerous than big ones — astronomers estimate near - Earth space likely contains millions of NEAs a few yards (meters) across, nearly 16,000 NEAs between 100 and 300 yards across, and nearly 5,000 NEAs between 300 and 1,000 yards in size.

Astronomers estimate that we have seen just 1 per cent of the asteroids larger than the one that leveled the forests of Tunguska, Siberia in 1908 — half a million are still out there, unseen.

This stellar «cannon fire» has continued once every 8.5 years for at least the past 400 years, astronomers estimate.

From these numbers, the astronomers estimate that roughly 35 000 objects larger than 100 kilometres across lie beyond Neptune's orbit.

These are rare and astronomers estimate they have already found and are tracking 94 per cent of them via software models.

Astronomers estimate that around 2000 stars reside within Trumpler 14, ranging in size from less than one tenth to up to several tens of times the mass of the Sun.

Astronomers estimate similar - sized events occur every one to three centuries.

Based on Hubble Space Telescope photographs of Pluto's newfound companion, astronomers estimate the moon to be just a few dozen kilometers in diameter.

Astronomers estimate that wandering Jupiter - mass planets without a parent star are about a tenth as common as once believed, Ashley Yeager reported in «Giant solo planets are in limited supply» (SN: 8/19/17, p. 10).

Astronomers estimate that it is less than one mile across.

In the Milky Way, astronomers estimate, one goes off every 30 to 50 years.

Astronomers estimate the age of the universe in two ways: 1) by looking for the oldest stars; and 2) by measuring the rate of expansion of the universe and extrapolating back to the Big Bang; just as crime detectives can trace the origin of a bullet from the holes in a wall.

Some astronomers estimate this could happen as soon as 1 trillion years from now.

Luke, wrote, «Until recently, astronomers estimated that the Big Bang occurred between 12 and 14 billion years ago.»

Until recently, astronomers estimated that the Big Bang occurred between 12 and 14 billion years ago.

By mapping the motion of the gas throughout the structure, the astronomers estimated that the minimum mass of the entrained cool gas in both bubbles is equivalent to 2 million suns.

Then as now, astronomers estimated the distances to galaxies by studying Cepheid variables, an unusual class of stars whose brightness rises and falls predictably: The longer the period of variation, the more luminous the star.

In addition, by mapping the motion of particles in the structure, the astronomers estimated that the minimum mass of the cool gas is equivalent to 2 million suns.

Previously, astronomers estimated Jupiter's age with computer models.

With an angular separation from the primary of about 8.5 arc - minutes, the astronomers estimated a wide physical separation of about 4,000 AUs.

Based on its high cosmological redshift, astronomers estimated that GRB 000131 was emitted when the universe was less than one and a half billion years old — less than 10 percent of an estimated age of 12 to 14 billion years (ESO press release).

Not exact matches

Of an estimated 100 million television viewers — 10 times the number of people who tuned in for The Voice's season 1 finale — most stay up past the «main event» to watch former secretaries of the U.S. government debate nuclear policy with astronomer Carl Sagan.

«New method to estimate more accurate distances between planetary nebulae and the Earth: Astronomers develop a new method to estimate more accurate distances between planetary nebulae and the Earth.»

Such a measurement allows astronomers to estimate a world's mass, which, paired with the size estimate provided by a transit, yields a density and composition estimate.

For instance, astronomers have traditionally estimated the distances to remote galaxies using a spectrometer, which divides light from an object into its constituent wavelengths.

Based on a culmination of ten years of research work, the new method to estimate more accurate distances between planetary nebulae and the Earth developed by HKU astronomers promises a new era in scientists» ability to study and understand the fascinating if brief period in the final stages of the lives of low - and mid-mass stars.

The latest study to bolster this argument was presented earlier in the meeting by lead author Courtney Dressing, another CfA astronomer, who measured the masses and sizes of a handful of small transiting planets to estimate the rocky - to - gaseous transition zone.

To get a sense of how truly dark the Coalsack is, back in 1970, the Finnish astronomer Kalevi Mattila published a study estimating that the Coalsack has only about 10 percent of the brightness of the encompassing Milky Way.

Dreamed up in 1961 by astronomer Frank Drake, the equation provides an estimate of the number of detectable alien civilisations in the Milky Way.

Drawing on his data from the Hubble observations, Li estimates that the nucleus — the solid body of the comet itself — is no more than about 2.5 miles (4 kilometers) across, smaller than what many astronomers initially expected for such an energetic comet.

But planet hunting is in its infancy, and astronomer Dimitar Sasselov estimates that our galaxy harbors some 100 million «super-Earths,» large rocky planets whose stable atmospheres and complex chemistry actually make them mathematically better candidates for the emergence of life than our own small world.

Since the 1950s astronomers have solved this problem using «kinematic distances,» calculations that treat objects in the Milky Way a bit like pieces of flotsam spiraling into a whirlpool; because things tend to move faster as they approach the center, measuring how fast an object is moving toward or away from us yields an estimate of its distance from the galactic center — and thus from our solar system.

The estimate was presented at an international workshop on Jupiter for professional and amateur astronomers organised by Europlanet 2020 Research Infrastructure at the Observatoire de la Côte d'Azur in Nice, France.

This is a result in itself and, together with the reports of amateur astronomer John McKeon, has helped us come up with our preliminary estimate which slightly reduces previous estimates of the flux of impacting objects in Jupiter.

This allows astronomers to accurately estimate the energy and trajectory of the incident cosmic ray that caused the shower.

The team calculates an age of only 400 - 600 million years old, which agrees with the age estimated from its rotation period (a technique pioneered by CfA astronomer Soren Meibom).

An international team of astronomers used the NASA / ESA Hubble Space Telescope to estimate whether there might be water on the seven earth - sized planets orbiting the nearby dwarf star TRAPPIST - 1.

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.