折射度-物理参数，表现折射物体的光折射特性，光线穿过某不同密度物质所应改变方向的角度。
IOR - also known as Index of Refraction, a physical parameter of transparent matter that defines how strong a ray gets bent when entering media of different density.
大多数天体物理学家接受这个情形，自从依照广义相对论，充份密度物质任何集中一定必然坍缩为一个黑洞。
Most astrophysicists accept that this is the case, since according to general relativity, any concentration of matter of sufficient density must necessarily collapse into a black hole.
密度小的物质向上浮动并形成一层皮。
在我们的太阳附近，星际物质的平均密度比最好的地球实验室真空还要低1000到10000倍。
The average density of interstellar material in the vicinity of our Sun is 1,000 to 10,000 times less than the best terrestrial laboratory vacuum.
尽管它的视觉效果如此显著，但尘埃只是位于恒星之间的物质的一个次要组成部分，其密度极低。
Although its visual effect is so pronounced, dust is only a minor constituent of the material, extremely low in density, that lies between the stars.
石英等硅酸盐向下漂移，在到达地核时与密度更大的物质混合。
Silicates such as mineral quartz drifted downward and mixed with denser materials as they reached Earth's core.
类地行星主要是岩石：密度大的石块和金属物质，同时会有少量的气体。
The terrestrial planets are mostly rocks: dense rocky and metallic material, with minor amounts of gases.
其中一种不用高精度的化学方法验证物质的办法就是确定它的密度。
One way of identifying a substance without resorting to fiddly chemical methods is to determine its density.
今天宇宙学的一个关键问题就是：宇宙中物质的平均密度是多少？
One of the key scientific questions in cosmology today is: what is the average density of matter in our universe?
土卫十六密度较低，科学家因此推断它可能由多孔冰物质构成。
Its low density has led scientists to speculate that it may consist of porous, icy material.
要分辨一种物质，可以用密度测量法。而无须借助费事繁琐的化学分析法。
One way to identify a substance without resorting to fiddly chemical methods is to determine its density.
而根据这个状态，不是随时间而越来越弯曲，它所拥有的物质与能量必须在一个临界的，特别的密度。
For it to be held that way, rather than getting more and more curved over time, the amount of matter and energy it contains must be at a particular, critical density.
超新星爆发以后，剩余的物质可能塌缩为一个黑洞，也可能形成一颗密度极大的中子星。
After the supernova, the leftover matter could either have collapsed into a black hole or an extremely dense neutron star.
他们还能通过测量空间几何推断出宇宙中能量和物质的总密度，并推算暗能量的总和。
They can also measure the geometry of space. That allows them to deduce the total density of energy and matter in the universe and infer the amount of dark energy.
这个过程形成的炽热气泡结构恰好可以抵御周围分子云中密度更高物质的压力。
The process blasted out material to form the bubble structure of glowing gas against denser material in a surrounding molecular cloud.
低密度的聚乙烯是PVC很好的替代品，它的生产过程相对简单，也不需要添加化学物质增加柔软性。
Low density polyethylene makes a nice substitute for PVC. It has a simple makeup and doesn't require additives to make it soft and pliable.
科学家们将通过此次实验来研究一种名为夸克-胶子等离子体的物质，它是宇宙大爆炸后极短瞬间形成超高能量密度。
The experiments will allow scientists to study a substance called the quark-gluon plasma, which existed in the fleeting first moments after the Big Bang.
大多数物质遇冷收缩，所以他们的密度在固态时高于液态。
Most substance contract when they freeze so that the densityof a substance’s solid is higher than the density of its liquid.
顺势疗法据称是通过溶解物质到密度几乎为0，以期刺激身体产生自愈。比如硫。
Homeopathy purportedly works by diluting substances, such as sulfur, to almost nothing and then using them to spur the body to heal itself.
Turner认为，说暗能量是所有物质中最神秘的，一点都不夸张。科学家估计暗能量占宇宙能量密度的74%。
Turner thinks dark energy is the biggest mystery of them all—and quite literally, since physicists predict that it makes up 74 percent of energy density in the universe.
很多精力都集中在研究宇宙膨胀过程中暗物质密度如何变化。
Much effort focuses on how the density of dark energy changes as space expands.
黑洞是被认为存在于大多数星系中心的密度极大的物质，它具有非常强的引力，可以吸收光线。
These are extremely dense masses believed to exist at the center of most galaxies. Their gravitational pull is so strong, they absorb light.
由于深层水体的温度较低，密度较高，因此，沉降到透光层下的任何物质都会在那个深度停留很久。
Any that sinks below the sunlit top layers will hang around in the depths for a long time, thanks to the colder temperature and greater density of the deep water.
但是适度的饮酒也增加高密度脂蛋白，有益胆固醇和其他一些有助于健康的物质。
But modest alcohol consumption also raises HDL, the good cholesterol, and other substances that promote heart health.
这些图片将会用来测试是否如之前模型所预测的一样，暗物质在某些星系集群里密度更大。
These maps are being used to test previous results that suggest that dark matter is more densely packed inside clusters than some models predict.
密度测量结果意味着这些物质一定是水晶，而被许多人珍视的钻石，实质是碳元素的单质晶体。 也就是说，那颗行星的大部分可能都与钻石类似。
The density means that this material is certain to be crystalline, that is, a large part of the star may be similar to a diamond.
密度测量结果意味着这些物质一定是水晶，而被许多人珍视的钻石，实质是碳元素的单质晶体。 也就是说，那颗行星的大部分可能都与钻石类似。
The density means that this material is certain to be crystalline, that is, a large part of the star may be similar to a diamond.
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