I can't tell you now the distance in lightyears or what star this was, though you can see it with the naked eye at night in this hemisphere.

Tau Ceti is noted for being the nearest Sun-like star at a distance of 11. 9 light-years.

Its distance is unusual for a naked-eye star.

ω Centauri ( NGC 5139 ), despite being listed as the constellation's " omega " star, is in fact a naked-eye globular cluster, located at a distance of 17, 000 light-years with a diameter of 150 light-years.

In the Halo franchise, the weak, low-ranking Grunts of the Covenant originate on a frozen exoplanet named Balaho, where methane is a primary constituent of the atmosphere, prevents the planet becoming even more frigid than it already is due to its distance from its parent star, and thus, Grunts have evolved to utilize the gas for respiration.

Spectroscopy is also used in the determination of the distance of a star, using the red shift.

where R < sub > s </ sub > is the radius of the star, R < sub > o </ sub > is the occulting object's radius, and r is the distance from the star to the occulting object.

With this work under his belt, Bessel was able to achieve the feat for which he is best remembered today: he is credited with being the first to use parallax in calculating the distance to a star.

In 2007, using the Keck telescope, a team from California Institute of Technology found six star forming galaxies about 13. 2 billion light years ( light travel distance ) away and therefore created when the universe was only 500 million years old.

With an apparent brightness of 0. 03m, this is the second brightest star of the northern hemisphere ( after Arcturus ) and the fifth brightest star in all ; its spectral class is A0 V and it lies at a distance of only 25. 3 ly.

The following year he began studying star clusters ; large groupings of stars that are co-located at approximately the same distance.

This places the cloud at nearly a quarter of the distance to Proxima Centauri, the nearest star to the Sun.

Space is sufficiently rarefied that most lines from the Earth do not touch any star within this distance of Earth.

Mathematically, the light received from stars as a function of star distance in a hypothetical fractal cosmos is:

L ( r ) = average luminosity per star at distance r ;

Nurmi had won five gold medals in five events, but he left the Games embittered as the Finnish officials had allocated races between their star runners and prevented him from defending his title in the 10, 000 m, the distance that was dearest to him.

The first direct measurement of the distance to a star ( 61 Cygni at 11. 4 light-years ) was made in 1838 by Friedrich Bessel using the parallax technique.

The only exception is a faint image of a large star cluster containing hundreds of thousands of stars located one billion light years away — ten times the distance of the most distant star cluster previously observed.

It consists of two large spiral galaxies in the process of colliding with their nuclei orbiting at a distance of 1, 200 light-years, causing extensive star formation throughout both components.

* α Sge: also known as Sham, this yellow bright giant star of spectral class G1 II ( with 4. 37m ) lies at a distance of 610 light-years and together with β Sge ( also 4. 37m ) forms either the feathers of the shaft or the two-pointed arrow once used in the Roman army.

A sextant can also be used to measure the Lunar distance between the moon and another celestial object ( e. g., star, planet ) in order to determine Greenwich time which is important because it can then be used to determine the longitude.

At a distance of just under 12 light-years from the Solar System, it is a relatively nearby star.

However, the energy must be imparted over a limited distance ( determined by arm length ) and therefore ( because the projectile is accelerating ) over a limited time, so the limiting factor is not work but rather power, which determined how much energy can be added in the limited time available.

After each competitor has delivered all of their bowls ( four each in singles and pairs, three each in triples, and two bowls each in fours ), the distance of the closest bowls to the jack is determined ( the jack may have been displaced ) and points, called " shots ", are awarded for each bowl which a competitor has closer than the opponent's nearest to the jack.

Another method is to measure the brightness of an object and assume an intrinsic luminosity, from which the distance may be determined using the inverse square law.

The required distance ρ ( s ) at arc length s is defined in terms of the rate of rotation of the tangent to the curve, which in turn is determined by the path itself.

As well as achieving maximum momentum in the discus on throwing, the discus ' distance is also determined by the trajectory the thrower imparts, as well as the aerodynamic behavior of the discus.

The difference in phase between the two waves is determined by the difference in the distance travelled by the two waves.

On the most basic level, electronegativity is determined by factors like the nuclear charge ( the more protons an atom has, the more " pull " it will have on negative electrons ) and the number / location of other electrons present in the atomic shells ( the more electrons an atom has, the farther from the nucleus the valence electrons will be, and as a result the less positive charge they will experience — both because of their increased distance from the nucleus, and because the other electrons in the lower energy core orbitals will act to shield the valence electrons from the positively charged nucleus ).

The distance between DNA bands of a given length is determined by the percent agarose in the gel.

The radial velocity of cluster members can be determined from Doppler shift measurements of their spectra, and once the radial velocity, proper motion and angular distance from the cluster to its vanishing point are known, simple trigonometry will reveal the distance to the cluster.

However, NMR experiments are able to provide information from which a subset of distances between pairs of atoms can be estimated, and the final possible conformations for a protein are determined by solving a distance geometry problem.

Size and shape were determined by the visual angle subtended at the eye combined with perceived distance and orientation.

* Polar coordinate system, a 2D or 3D coordinate system, determined by an angle and a distance

In mathematics, the polar coordinate system is a two-dimensional coordinate system in which each point on a plane is determined by a distance from a fixed point and an angle from a fixed direction.

On distance scales larger than the string radius, each oscillation mode behaves as a different species of particle, with its mass, spin and charge determined by the string's dynamics.

The unit for radial distance is usually determined by the context.

The distance to Vega can be determined by measuring its parallax shift against the background stars as the Earth orbits the Sun.

It is usually determined by considering the distance between consecutive corresponding points of the same phase, such as crests, troughs, or zero crossings, and is a characteristic of both traveling waves and standing waves, as well as other spatial wave patterns.

As of 1980, the longest cost-effective distance for DC electricity was determined to be.

For n-bit integers with equal distance between quantization levels ( uniform quantization ) the dynamic range ( DR ) is also determined.

The size of this area is determined by the diffraction-limited resolution of the lens which is given by the Airy disk whose diameter is 2. 4λu / D, where λ is the wavelength of the light, u is the distance between the object and the lens, and D is the diameter of the lens aperture.

The chord of a wing, stabilizer and propeller is determined by examining the planform and measuring the distance between leading and trailing edges in the direction of the airflow.

Aggression between groups is determined partly by willingness to fight, which depends on a number of factors including numerical advantage, distance from home territories, how often the groups encounter each other, competitive abilities, differences in body size, and whose territory is being invaded.

She and her father determined that the weather was too rough for the lifeboat to put out from Seahouses ( then North Sunderland ), so they took a rowing boat ( a 21 ft, 4-man Northumberland coble ) across to the survivors, taking a long route that kept to the lee side of the islands, a distance of nearly a mile.