The exploration of Mars has attracted a lot of attention. What is the atmosphere of Mars mainly composed of? A. Oxygen and nitrogen B. Carbon dioxide C. Hydrogen and helium D. Methane 相关知识点: 试题来源: 解析 B。火星的大气层主要由二氧化碳组成。选项 A 氧气和氮气不是火星大气层主要成...
Mood refers to the internal feelings and emotions provoked in the audience, while atmosphere is about the external setting and environment's tone.
Way to Find Out]]>Spotts, Pete
A seasonal Blue Moon is the traditional definition of a Blue Moon and refers to the thirdfull moonin a season that has four full moonsaccording to NASA. The second definition — which arose from a misunderstanding of the original — is the monthly Blue Moon, referring to the second full mo...
The temperature on Mars is relatively low, averaging about minus 80 degrees Fahrenheit (minus 60 degrees Celsius).
The main goal of any astronomical telescope is to gather light. People often focus on the telescope’s magnification, which is actually less important than the instrument’s ability to collect more light than the observer’s unaided eye can. When choosing a telescope, many different characteristics...
John Stevenson
It is here that the earliest and some of the strongest evidence for an extraterrestrial (something from outside the earth's atmosphere) cause for dinosaur extinction has come. Because the record is more complete in marine rocks, the time units studied are much smaller and more accurate. The ...
In new research from NASA’s Goddard Institute for Space Studies and Columbia University, scientists found that the most powerful scale of eruption — which emits a mind-boggling amount of material into the atmosphere — would probably not plunge Earth into a deep, cold volcanic winter....
at least one planetary scientist’s bête noire given that it resists all the techniques used to investigate planetary interiors. The planet has an atmosphere that is opaque to remote optical observations and the extreme conditions on the surface make it incredibly challenging to operate seismometers...