It is shown that hitherto mysterious properties of spiral galaxies can be understood if they have massive halos composed of unseen material, the elements of which are in motion radially in-and-out from the galactic center to an outer boundary with a radius of at least 100 kpc.A similar more...
A.It is being larger and larger slowly.B.It is attracting more new stars to its edge.C.It is losing a 10billionyearold round flat star.D.It is slightly accelerating toward the galactic center. 相关知识点: 试题来源: 解析 D 1. **选项A分析**:太阳系的规模主要由行星轨道范围决定,目前没...
Geomagnetic storms occur from solar activity. The sun is a bubbling hot cauldron of non-stop activity that occasionally gives off solar flares, which in turn can trigger what's known as a Coronal Mass Ejection or CME.
Here are some insights into how many serial entrepreneurs create a string of successful enterprises. What is a serial entrepreneur? A serial entrepreneur is an individual who starts, manages, and (ideally) sells multiple businesses or ventures throughout their career. Unlike traditional entrepreneurs ...
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What is galactic astronomy? Which type of star cluster contains the most stars? What type of star is Alpha Centauri? What type of star is Deneb? What is solar declination? What constellation is the sun in? Which planet does not have a magnetic field in the solar system?
So there is still a lot ofempty space and gas among all those black holes.Chuck Hailey is an astronomer at ColumbiaUniversity in New York. He said, “There're lots ofactions going on there.. The galactic center is astrange place. That's why people like to study it Hailey said there ...
Thus, dark matter's gravitational impact is extremely spread out and, it turns out, can only be observed when we look at the large-scale distribution of visible matter in the universe: things like galactic superclusters and the corresponding super-voids. It's theorized that after the Big Bang...
. On the other hand, these are also those GCs for which more precise data can be obtained. A similar bias can of course be present in case spectroscopy is used to define the populations fractions. It would be interesting to extend the same kind of studies to a sample fully representative...
The Large Magellanic Cloud is adwarf irregular galaxy, although it shows signs of once having spiral arms. It has anoff-center barrunning through the middle of it. One disrupted spiral arm continues to protrude disjointedly from the bar. ...