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What is Hubble's law? Why is there so much uncertainty about the value of the Hubble constant?
什么是哈勃定律？为什么对哈勃常数的值存在如此大的不确定性？
Why is the relative abundance of hydrogen and helium such an important parameter in the modeling of the early universe?
为什么氢和氦的相对丰度是早期宇宙建模中的一个重要参数？
Describe the contribution of the 3K cosmic background radiation to the modeling of the early universe.
描述3K宇宙背景辐射对早期宇宙建模的贡献。
Place white dwarfs, red giants, neutron stars and black holes into the framework of stellar evolution.
将白矮星、红巨星、中子星和黑洞纳入恒星演化的框架中。
How are the elements heavier than iron synthesized in the universe?
重于铁的元素在宇宙中是如何合成的？
Describe the stages in the "big bang" model of the formation of the universe.
描述“大爆炸”模型中宇宙形成的各个阶段。
How is the temperature of the big bang related to the expansion time?
大爆炸的温度与膨胀时间有何关系？
What is meant by "inflation" in the big bang scenario and what problems does it address?
在大爆炸模型中，“膨胀”指的是什么？它解决了哪些问题？
How is the energy of the universe divided between radiation and matter at the present time?
宇宙中的能量目前是如何分配在辐射和物质之间的？
Homework set #19
第19次作业 |