The diffuse light of the night sky (LONS) is considered by most astronomers to be an unfor- tunate source of interference with observations of stars, galaxies, and nebulae. The natural LONS is due in nearly equal parts to night air- glow... JK Kalinowski,RG Roosen,JC Brandt 被引量: ...
The existence of intergalactic dust has been proved by the following observational facts: the decrease of the numbers of distant galaxies and clusters of galaxies behind the central regions of near clusters of galaxies; the different distributions of RR Lyrae stars and galaxies near 喂 Microscopii ...
In most situations light helps us see. But when it comes to looking at the night sky light is actually a kind of pollution. It prevents our view of some of life’s most striking sights: stars planets and even galaxies.“When I was a little boy I loved the night sky. I remember look...
aSpiral galaxies can be normal or barred. Arms in a normal spiral start close to the center of the galaxy. Barred spirals have spiral arms extending from a large bar of stars and gas that passes through the center of the galaxy. 旋涡星云可以是正常的或禁止。 胳膊在一个正常螺旋开始紧挨星系...
The galactic disc is the plane in which the spirals,bars and discs of disc galaxies exist.Galaxy discs tend to have more gas and dust,and younger stars than galactic bulges,or galactic haloes.The galactic disc is mainly composed of gas,dust and stars.The gas and dust component of the ...
stars Delta Eri (K0 IV) and Mu Her A (G5 IV), indicates that beryllium existed in significant amounts relatively early in the history of the Galaxy... D Dravins,L Hultqvist - 《Astronomy & Astrophysics》 被引量: 2发表: 1977年 Synthesis of Elements and Solid Structures in Atomic-Nucle...
aSpiral galaxies can be normal or barred. Arms in a normal spiral start close to the center of the galaxy. Barred spirals have spiral arms extending from a large bar of stars and gas that passes through the center of the galaxy. 旋涡星云可以是正常的或禁止。 胳膊在一个正常螺旋开始紧挨星系...
The galactic disc is the plane in which the spirals,bars and discs of disc galaxies exist.Galaxy discs tend to have more gas and dust,and younger stars than galactic bulges,or galactic haloes. The galactic disc is mainly composed of gas,dust and stars.The gas and dust component of the ...
"Things seem to be progressing largely as they have been, except for a shift in wind and less ash," Poland said. The ash-filled plume Tuesday prompted warnings to pilots to stay away. For those on the ground near active lava vents, similar health warnings were issued because of dangerous...
Nearly 230,000 tonnes of plastic is dumped into the Mediterranean Sea every year, a figure which could more than double by 2040 unless "ambitious" steps are taken, the International Union for the Conservation of Nature said Tuesday.