Sentences with phrase «for planetary masses»

Not exact matches

All of these scientific hypotheses boil down to first there was an planetary mass covered with water and providing the correct conditions for chemical reactions to create a simple organic compound from which life was formed.

The International Astronomical Union defines «planet» as a celestial body that, within the Solar System that is in orbit around the Sun; has sufficient mass for its self - gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape; and has cleared the neighbourhood around its orbit; or within another system, it is in orbit around a star or stellar remnants; has a mass below the limiting mass for thermonuclear fusion of deuterium; and is above the minimum mass / size requirement for planetary status in the Solar System.

After shining for many millions of years, stars end their lives, mainly, in two ways: very high mass stars die very violently as supernovae, while low mass stars end as planetary nebulae.

All that extra mass creates internal pressures far exceeding terrestrial squeezing, with implications for three life - critical planetary properties: the maintenance of oceans, climatic «thermostats» and magnetic fields.

The data required first, planetary mass, is for example provided by the HARPS - spectrograph in Chile, which was developed by the University of Geneva and Bern in cooperation with further partners.

Such compensation for mass is commonly found on planetary bodies, including on Earth.

ARM will demonstrate advanced, high - power, high - throughput solar electric propulsion; advanced autonomous high - speed proximity operations at a low - gravity planetary body; controlled touchdown and liftoff with a multi-ton mass from a low - gravity planetary body, astronaut spacewalk activities for sample selection, extraction, containment and return; and mission operations of integrated robotic and crewed vehicle stack — all key components of future in - space operations for human missions to Mars.

A team led by astronomer Kevin Luhman of the Harvard - Smithsonian Center for Astrophysics (CfA) in Cambridge, Massachusetts, found extra emissions of infrared light from a faint dwarf with just 15 times Jupiter's mass — at the threshold of what astronomers consider «planetary mass.»

Jayawardhana calls them planemos (for «planetary mass objects»).

This is the first known example of a gravitationally bound pair of planetary mass objects, and astronomers can't agree on a name for them.

Other astronomers find the detections convincing, although most reserve the name «planet» for bodies that form within a planetary system and orbit stars, says theorist Alan Boss of the Carnegie Institution of Washington in Washington, D.C. «They should call them «planetary - mass brown dwarfs,»» Boss says.

Gravitational microlensing works by a planetary body — or any body for that matter with significant mass, such as a brown dwarf or even a black hole — passing in front of a star.

The distinction between planetary systems and binary systems is especially fraught for the lowest mass primaries.

formation around cool stars Abstract: The distinction between planetary systems and binary systems is especially fraught for the lowest mass primaries.

μm) spectra, obtained on the 2.7 m Harlan J. Smith Telescope at McDonald Observatory with the Immersion Grating INfrared Spectrometer (IGRINS)(Park et al. 2014, SPIE, 9147, 1), for a variety of Galactic PDRs including regions of high mass star formation, reflection nebulae, and planetary nebulae.

Orbital stability provides upper limits for the masses of the transiting companions that are in the planetary regime.

A new study has found that one of the nearest brown dwarfs to our Solar System, designated SIMP J013656.5 +093347 (SIMP0136 for short), might actually be a planetary - mass object.

For example, while still in its scientific checkout phase, scientists using ALMA have found evidence for Earth - mass planets around nearby stars; as it nears its full complement of 66 antennas, ALMA will deduce the presence of many more exoplanets and study the chemical composition of the planetary nurseriFor example, while still in its scientific checkout phase, scientists using ALMA have found evidence for Earth - mass planets around nearby stars; as it nears its full complement of 66 antennas, ALMA will deduce the presence of many more exoplanets and study the chemical composition of the planetary nurserifor Earth - mass planets around nearby stars; as it nears its full complement of 66 antennas, ALMA will deduce the presence of many more exoplanets and study the chemical composition of the planetary nurseries.

However, many others argue that only planemos that directly orbit stars should qualify as planets, preferring to use the terms «planetary body,» «planetary mass object» or «planemo» for similar free - floating objects (as well as planet - size moons).

The prospects for the habitability of M - dwarf planets have long been debated, due to key differences between the unique stellar and planetary environments around these low - mass stars, as compared to hotter, more luminous Sun - like stars.

The overabundance of brown dwarfs and low - mass planetary bodies skewing the IMF for the nebula will surely refine these models further, and by understanding how nearby nebulae form stars, we can gain a better comprehension of how their distant cousins do the same.

Occasionally these objects look something like planetary nebulae, as in the case of the Crab Nebula, but they differ from the latter in three ways: (1) the total mass of their gas (they involve a larger mass, essentially all the mass of the exploding star), (2) their kinematics (they are expanding with higher velocities), and (3) their lifetimes (they last for a shorter time as visible nebulae).

We demonstrate that the combination of observations from GAIA and PLATO will allow us to tightly constrain stellar masses, ages and radii with machine learning for the purposes of Galactic and planetary studies.

Abstract: Based on more than four weeks of continuous high cadence photometric monitoring of several hundred members of the young cluster NGC 2264 with two space telescopes, NASA's Spitzer and the CNES CoRoT (Convection, Rotation, and planetary Transits), we provide high quality, multi-wavelength light curves for young stellar objects (YSOs) whose optical variability is dominated by short duration flux burs... ▽ More Based on more than four weeks of continuous high cadence photometric monitoring of several hundred members of the young cluster NGC 2264 with two space telescopes, NASA's Spitzer and the CNES CoRoT (Convection, Rotation, and planetary Transits), we provide high quality, multi-wavelength light curves for young stellar objects (YSOs) whose optical variability is dominated by short duration flux bursts, which we infer are due to enhanced mass accretion rates.

The well - determined planetary properties and unusually large mass also make this planet an important benchmark for theoretical models of super-Jupiter formation.

The class D (for Degenerate) is the modern classification used for white dwarfs — low - mass stars that are no longer undergoing nuclear fusion and have shrunk to planetary size, slowly cooling down.

Assuming the rocky world has the smallest physical size allowed for its mass (94 % Earth's diameter), according to planetary formation models this would consist of a metal core, making up for 65 % of the mass of the entire planet.

This B star lost most of its mass — more than the mass of the sun — into a wind that shines for a while as a planetary nebula.

For each planetary candidate, the equilibrium surface temperatures are derived from «grey - body spheres without atmospheres... [and] calculations assume a Bond albedo of 0.3, emissivity of 0.9, and a uniform surface temperature... [with uncertainties of] approximately 22 %... because of uncertainties in the stellar size, mass, and temperature as well as the planetary albedo.»

They could be departing explorers searching for a new world or perhaps the escape of a group of planetary refugees, a mass exodus of humanity.

Why was he trying to invoke «planetary rotation» as a method for getting buoyant air masses down from altitude in the absence of radiative gases?

When President Obama's Council of Advisors on Science and Technology spread panic in August 2009 about the purported dangers of a swine flu epidemic breaking out later that year, Alex Newman wrote for The New American at that time: «The co-chair of Obama's advisory council that issued the report, John Holdren, actually co-authored a book titled Ecoscience calling for forced abortions, mass sterilization, and a «planetary regime» with the power to enforce the sick notions.

The Earth has experienced five mass extinctions before the one we are living through now, each so complete a slate - wiping of the evolutionary record it functioned as a resetting of the planetary clock, and many climate scientists will tell you they are the best analog for the ecological future we are diving headlong into.

Re 51 Tom P — watched the video; and I agree that the sun does wobble around the center of mass of the solar system; the center of mass itself is not tending to wobble around the sun because conservation of momentum applies to the solar system as a whole (except of course for the forces applied to it by nearby stars, the rest of the galaxy, etc, but those are not varying so fast and so the center of mass should generally be moving along rather smoothly on the same timescale as planetary motions).