Image From: https://images.nasa.gov/details-PIA00224
伽利略号木星探测器拍摄的月球西侧
Image From: https://images.nasa.gov/details-PIA00224
作者： 荒原之梦
Image From: https://images.nasa.gov/details-PIA00224
地球的清晨
美国陆军M777-A2型155毫米榴弹炮
从国际空间站看飓风吉纳维芙
正在远离国际空间站的日本HTV-9货运飞船
Image From: https://images.nasa.gov/details-iss063e074252
糖果色的火卫一
Image From: https://www.nasa.gov/image-feature/candy-colored-phobos
SpaceX Crew-1 载人飞行任务乘员徽章
Image From: https://images.nasa.gov/details-jsc2020e026314
Artemis I 任务中的猎户座飞船即将组装完毕
Image Credit: NASA/Frank Michaux
Image From: https://images.nasa.gov/details-KSC-20200810-PH-FMX01_0011
[设想图] NASA 重返月球
![[设想图] NASA 重返月球](https://documents.zhaokaifeng.com/uploads/2020/08/17/5d69ab631dabbc7dfa20a73efbf5ebd563ee34bd348cf2a0b41c38effd450923.webp)
Image From: https://www.nasa.gov/feature/nasa-perseveres-through-pandemic-looks-ahead-in-2020-2021
[线代]行列式中涉及确定正负的三种情况
NASA 机智号火星直升机的能源系统已被远程唤醒
Image From: https://www.nasa.gov/feature/jpl/nasas-ingenuity-mars-helicopter-recharges-its-batteries-in-flight
从国际空间站看遭受爆炸后的贝鲁特港
2011年考研数二第04题解析
题目
微分方程 $y^{”} – \lambda^{2}y = e^{\lambda x} + e^{- \lambda x} (\lambda > 0)$ 的特解形式为 $?$
$$
A. a (e^{\lambda x} + e^{- \lambda x})
$$
$$
B. ax (e^{\lambda x} + e^{- \lambda x})
$$
$$
C. x (ae^{\lambda x} + be^{- \lambda x})
$$
$$
D. x^{2} (ae^{\lambda x} + be^{- \lambda x})
$$
月球上的激光反射器[下]
Image From: https://www.nasa.gov/feature/goddard/2020/laser-beams-reflected-between-earth-and-moon-boost-science
月球上的激光反射器[上]
Image From: https://www.nasa.gov/feature/goddard/2020/laser-beams-reflected-between-earth-and-moon-boost-science