Sentences with phrase «most planetary nebulae»

As for most planetary nebulae, the distance of M27 (and thus true dimension and intrinsic luminosity) is not very well known.

The dynamical effects of two stars orbiting one another most easily explains the intricate structures, which are much more complicated than features seen in most planetary nebulae.

Most planetary nebulae are only a light year or so across, so this is a fantastically vast and gossamer structure.

But most planetary nebulas are not round.

Not exact matches

More accurate distances between the most common type of «planetary nebulae» and the Earth can be estimated simply with three sets of data: firstly, the size of the object on the sky taken from the latest high resolution surveys; secondly, an accurate measurement of how bright the object is in the red hydrogen - alpha emission line; and thirdly, an estimate of the dimming toward the nebula caused by so called interstellar - reddening.

As big planetary nebulae are the most common, we will use our new scale in making an unbiased census of planetary nebulae in the Milky Way, which will then help answer some important research questions.»

But while only the occasional star makes its exit as a supernova, most stars in the cosmic census — including our sun — will be blown away by the winds of change, and their gravestones will be planetary nebulas.

Most satisfying of all, the menagerie of simulated planetary nebula shapes looked a lot like the creatures in the real planetary nebula zoo.

This Hubble telescope image shows one of the most complex planetary nebulae ever seen, NGC 6543, nicknamed the «Cat's Eye Nebula.»

As usual for planetary nebulae, M76's visual magnitude is much brighter (9.6 according to Don Machholz» personal estimate, 10.1 according to Hynes; the present author thinks this is close to his own perception) than photographically (most sources agree on 12.2 mag photographically).

The observations have allowed astronomers to construct the most precise three - dimensional model of the glowing gas shroud, called a planetary nebula.

This is due to the fact that most visual light is emitted in one spectral line, the green 5007 Angstrom forbidden line of doubly ionized oxygen, [O III](see our Planetary Nebulae page).

In fact, the researchers found that chondrules were most likely created by the collision of such moon - sized planetary embryos: These bodies smashed together with such violent force that they melted a fraction of their material, and shot a molten plume out into the solar nebula.

Though the Cat's Eye Nebula was one of the first planetary nebulae to be discovered, it is one of the most complex such nebulae seen in space.

The Bug Nebula, NGC 6302, is one of the brightest and most extreme planetary nebulae known.

Since then, she has done research on star formation, extragalactic ionized nebulae, classical novae, supernova remnants, and most of all, planetary nebulae.

The additional 42 entries were mostly discovered earlier, and most of them (32) are open star clusters; there are no planetary nebulae, supernova remnants, elliptical and lenticular galaxies among them, and the only spiral galaxy in this list is our own, the Milky Way.

Actually, as for almost all planetary nebulae, most of the visible light is even emitted in one spectral line only, in the green light at 5007 Angstrom (see our planetary nebula description)!

The Cat's Eye Nebula was one of the first planetary nebulae to be discovered and is one of the most complex such nebulae seen in space.

This planetary nebula is certainly the most impressive object of its kind in the sky, as the angular diameter of the luminous body is nearly 6 arc minutes, with a faint halo extensing out to over 15», half the apparent diameter of the Moon (Millikan 1974).

A planetary nebula is a phase of stellar evolution that the sun should experience several billion years from now, when it expands to become a red giant and then sheds most of its outer layers, leaving behind a hot core that contracts to form a dense white dwarf star.

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.

This NASA Hubble Space Telescope image shows one of the most complex planetary nebulae ever seen, NGC 6543, nicknamed the «Cat's Eye Nebula.»