A. Its distance from other stars B. Its age C. Its mass D. The amount of dust around it 相关知识点: 试题来源: 解析 C。解析:The size and brightness of a main-sequence star depend on its mass.表明主序星的大小和亮度取决于它的质量。反馈...
1. absolute brightness - the brightness a star would have if it were 10 parsecs from Earth. Looking for patterns If we plot a graph of luminosity against temperature for lots of stars we get a graph like this… HR DIAGRAM AND STAR SIZES!. So, we know how to measure the following prope...
What is a star whose brightness changes called? What is the angular size of the Sun? What type of star is the Sun? How far is 100 astronomical units? What is the size of the sun? What size is the sun compared to other stars?
For helium, we use Y, that is the fraction of He in mass. The interquartile of a distribution is the range of values including the middle 50% of the distribution, leaving out the highest and lowest quartiles. Alternative estimates of the current masses for MC clusters are provided by ...
Visual Magnitude: This is the astronomer's scale for measuring the brightness of objects in the sky. The dimmest object visible in the night sky under perfectly dark conditions is about magnitude 6.5. Brighter stars are magnitude 2 or 1. The brightest objects get negative numbers. Venus can b...
it had faded from its peak brightness, leaving behind it a smudge of diffuse color. Today, it's comparable in brightness to Titan, one of the moons of Saturn. (Neither Titan nor the Crab Nebula are visible to the unaided eye, but with a dark sky and cooperative weather, you can find...
Because of the universal nature of the Chandrasekhar limit, all such supernovae have (as a first approximation) the same absolute brightness and can thus be used as standard candles in a similar fashion to Cepheids (but without the need to first measure any auxiliary observable, such as a ...
Within a logarithmic scale, zero emerges as the absolute lowest conceivable value. In the realm of logarithms, this equates to an outcome of one, as any numerical entity raised to the power of zero invariably results in one. Grasping this fundamental facet of logarithmic scales is important whe...
How bright is a star? A planet? A galaxy? When astronomers want to answer those questions, they express the brightnesses of these objects using the term "luminosity". It describes the brightness of an object in space. Stars and galaxies give off variousforms of light. Whatkindof light they...
All Cepheids with the same period are assumed to have the same absolute magnitude. If two Cepheids have the same period, but one is dimmer than the other, we can determine that the dimmer one is further away and can use it to calculate the distance. See the link above (C.S.I.R.O...