In the universe, a large amount of dark matter, whose nature ___ still a mystery, affects the movement of galaxies. A. is B. are C. was D. were 相关知识点: 试题来源: 解析 A。解析:本题考查主谓一致和时态。whose引导的定语从句修饰的是dark matter,这是一个单数概念,虽然前面有a large...
aBut scientists have discovered many othergalaxies in the universe. They are a long way away and their light has travelled for many years to reach us. it ishard to understand how large the universe is. 但科学家在宇宙发现了许多othergalaxies。 他们是长的路,并且他们的光移动许多年到达我们。 它...
The densities of intergalactic dust are estimated to be between 5脳10 30 g cm 3 (near the centers of clusters of galaxies) and 2脳10 34 g cm 3 (in general intergalactic space). The grains may be formed either in the early phases of the Universe (25...
aThis is not the case in America,of course,and the difference can be very striking. 这不是实际情形在美国,当然和区别可以是非常醒目的。[translate] awho has looked afteryou all these years? 谁看了afteryou所有这些岁月?[translate] aThe universe, the galaxies and Mars 宇宙、星系和火星[translate...
Much like detectives study fingerprints to identify the culprit, scientists used NASA's Hubble and Spitzer space telescopes to find the "fingerprints" of water in the atmosphere of a hot, bloated, Saturn-mass exoplanet some 700 light-years away. And, the
aBut scientists have discovered many other galaxies in the universe. They are a long way away and their light has travelled for many years to reach us. it is hard to understand how large the universe is. 但科学家在宇宙发现了许多其他星系。 他们是长的路,并且他们的光移动许多年到达我们。 了...
Tracing the Dynamics of Disk Galaxies with Optical and IR Surface Photometry: Color Gradients in M99 We present optical and IR surface photometry of M99 (NGC 4254) at g, r_S i, J and K'. We also present a K' image of M51 (NGC 5194) for comparison. Fourier ... RA Gonzalez,JR Gra...
Solar energy is a vibrant research topic, attracting scientists interested in many different approaches. For example, MIT researchers Angela Belcher and Paula Hammond are exploring approaches to solar power that would harness the power of biological organisms to create solar devices; Penny Chisholm and...
An international team of researchers has found evidence that suggests atmospheric CO2 levels at the end of the Triassic era were nearly the same as those predicted for the 21st century. In their paper published in the journal Nature Communications, the g
aBut scientists have discovered many other galaxies in the universe. They are a long way away and their light has travelled for many years to reach us. it is hard to understand how large the universe is. 但科学家在宇宙发现了许多其他星系。 他们是长的路,并且他们的光移动许多年到达我们。