(1) The distance can be expressed in light-years.

(2) It is only 93 light-years away, closer than most of the red giants.

(3) Mirphak is an F5-type giant, 620 light-years away and 6000 times as luminous as the Sun.

(4) The nebula is nearly 50 light-years in diameter, and may owe much of its illumination to Deneb.

(5) It is around 7700 light-years away, with a central region about 25 light-years in diameter.

(6) Altair, at a distance of 17 light-years, is one of the closest of the bright stars.

(7) Considered 33 years later, that ad was light-years ahead of its time.

(8) It is 42 light-years away, and over 150 times as luminous as the Sun.

(9) The outer disk contains unusual light-year long orange filaments.

(10) Within just a light-year of the black hole swarm more than 100,000 other stars caught far more firmly in its grip.

(11) About a light-year across, the ring material itself was likely shed by the star about 20,000 years before it went supernova, according to HubbleSite.

(12) It spans about 3,000 light-years in diameter, compared to the Milky Way's 100,000 light-year diameter.

(13) It is bluish-white, and 780 times as luminous as the Sun; its distance is 85 light-years.

(14) Most of the other stars that are visible to the naked eye lie within a few hundred light-years of us.

(15) Estimates of the distance of the galactic centre vary somewhat, but 30000 light-years is not far from the truth.

(16) The average separation between the stars at its centre is no more than a tenth of a light-year.

(17) Tau Ceti is a close neighbour, at a distance of only 12 light-years.

(18) Seen so clearly in this sharp Hubble Space Telescope image, the truly cosmic eye is over half a light-year across.

(19) Its bright ring with pearls of glowing gas is half a light-year across.

(20) By 2011 debris in the center of the ring, which is about a light-year in diameter, was blazing more intensely as the supernova entered a new stage of stellar demise.

(21) Clues might include the high 1000-kilometer per second speed of the expelled gas, the light-year long length of the structure, and the magnetism of the star visible above at the nebula's center.

(22) None of those planets are like Gliese 581 g, a rocky world about three times the mass of Earth orbiting -- along with five sibling planets -- a red dwarf star 20 light-year from Earth.

(23) The object is actually a shell of gas and dust that has been blown off by a faint central star, lying around 700 light-year away in the constellation of Aquarius.

(24) Scientists have already proposed that a hidden star, which they call 'Nemesis,' might exist a light-year or so away from our sun.