| 1. | Thus, the infant science of protostar observation has a variety of tools at its disposal .
这样一来，观测原恒星这门年轻的科学，就拥有许多种可以利用的工具了。 |
| 2. | The embryo inside the protostar is less massive than the envelope; most of the mass is still falling inward .
原恒星内部的胚胎的质量比包壳小，大部分物质一直在朝中心落去。 |
| 3. | The conditions in a protostar resemble far more closely in situation in red giants, most of whose volume is caught up in stormy convection .
原恒星的条件更加类似于红巨星的情形，红巨星体积的大部分都卷入剧烈的对流中。 |
| 4. | Models of protostar also show that they will have
原恒星的理论模型显示它们会有 |
| 5. | Since there is no nuclear reaction inside the protostar , a protostar is not a star yet
由于在原恒星的核心尚未发生核聚变，它们仍不能称为真正的恒星。 |
| 6. | If the protostar is slightly more massive than a planet , but not massive enough to burn its nuclear fuels , it becomes a
如果一颗原恒星的质量只是比行星大少许，它的中心便不能产生热聚变，成为一颗昏暗而难以被发现的 |
| 7. | Most of the energy generated in the protostar stage comes from the gravitational energy of the cloud , just like a ball will drop with increasing speed from your hand if you release it
在原恒星阶段，星体的能量主要来自星际云引力塌缩时所释放的位能，犹如树上的苹果会向下掉一样。 |
| 8. | The luminosity per surface area will increase because the temperature increases . but if a star is not very massive , its luminosity will drop because the size of the star protostar decreases much faster
每单位面积的光度会随著恒星的温度增加而上升，但假若恒星原恒星质量不足，它的光度会由于星体体积下降过速而不升反减。 |
| 9. | Which is very dim and hence very difficult to find . if it is massive enough though model dependent , the lower mass limit is about 0 . 1 solar mass , the gas in the protostar continues to heat up until the central portion becomes hot and dense enough for , say , the hydrogen nuclei to overcome their mutual electrical repulsion . nuclear fusion will then take place and a star is finally born
如果原行星质量足够大下限约为0 . 1个太阳质量，要注意的是，不同的理论模型会给出不同的下限，原恒星会不断变热，直至核心部分足够热和高压，令氢原子核克服质子间的电排斥力，产生核聚变，成为一颗真正的恒星。 |
