A historic progress on recent studies of whether there is a possible age-metallicity relation of stars in the Galactic disk, especially in the Galactic thick disk, is reviewed in some details.
The sharp image shows stunning features in the galaxy's face-on disk of stars and dust along with background galaxies, some visible right through M101 itself.
The new model, which tracks thousands of tiny particles beyond the orbit of Neptune, could help astronomers work out the properties of planets in other stars' dust disks.
At their distances from the star, the rocky planetary core would have taken so long to form that the gaseous disk would have dissipated before the core could attract the gas.
来自互联网
5. 极环星系是种稀有的星系类型，它们有着几乎和银盘平面垂直，呈环形公转的大量的恒星、气体和星尘。
A rare galaxy type, polar ring galaxies have a substantial population of stars, gas, and dust orbiting in rings nearly perpendicular to the plane of the galactic disk.
They go around in the plane of the blackboard, say, and so this matter cannot fall radially in but it will fall in and spiral in and forms what we call an accretion disk around the neutron star.
来自互联网
7. 含有脉冲星和吸积盘的双星系统出现在大约1430的位置。
Binary star systems containing a pulsar and an accretion disk occur beginning at about 14:30.
Seen here with its three known moons, Charon, Nix, and Hydra, Pluto is a member of a group of objects that orbit in a disklike zone beyond the orbit of Neptune called the Kuiper belt.
来自互联网
9. 后来的数值模拟结果显示出，即使伴星的轨道半径大如海王星的轨道，它仍可汲取物质而形成吸积盘。
Later simulations show that even a companion with an orbit as wide as Neptune's could scoop up an accretion disk.
来自互联网
10. NGC 2976不像典型的涡旋星系：它有一个星暴盘，但看不到旋臂；
NGC 2976 does not look like a typical spiral galaxy. It has a star-forming disk, but no obvious spiral pattern.
In my own chart for example, Saturn is conjunct Neptune, squaring Uranus and trining Jupiter. This means for me that the highest level of achievement is spiritual.
In this paper, using disk-instability model and starburst model, the AGN optical variability and spectral slope variability are simulated and confronted with observations.
来自互联网
13. 晷针垂直于晷盘，平行于地轴，指向天北极(北极星附近)。
The gnomon in the middle is perpendicular to the plate, parallel to the earth's axis, and points to the celestial North Pole (near the north Star).
The image highlights the galaxy's structure: a subtle, reddish bulge surrounding a bright nucleus, a blue disk of stars running parallel to the dust lane, and a transparent outer halo.
All Planets above the Earth, make a man illustrious and generally known far and near, and being all swift in motion, render him dextrous and nimble in the dispatch of affairs.
All Planets above the Earth, make a man illustrious and generally known far and near, and being all swift in motion, render him dextrous and nimble in the dispatch of affairs.
