Astronaut Mark Vande Hei Gets His Eyes Checked on Station


NASA astronaut Mark Vande Hei gets detailed views of his retina as part of regularly scheduled eye checks on the station.

Comments

Post a Comment

Popular posts from this blog

Via the ACLU: Drug Treatment is Infrastructure

Drug Treatment is Infrastructure COVID-19 was not the only deadly public health crisis of the past year and a half. The overdose epidemic killed a record 93,000 Americans in 2020, ravaging communities across the country, and may be on track to be worse in 2021 . While the nation has combated COVID-19 by prioritizing medical research, vaccine production, treatment development, and implementation of common-sense public health measures, our response to the overdose epidemic has been tragically meager. In this moment of investment in our nation’s infrastructure, it is time for federal, state, and local governments to change course and invest in proven, life-saving public health tools to finally stem the tide of overdoses across the country. It is no mystery what prevents overdose deaths. Studies consistently show that medical treatment and prevention, not punishment , saves lives. Yet, the most effective support for our family members, friends, and neighbors who use drugs are largely u...
Read more

Gigantic Jet Lightning from Puerto Rico

Image
Have you ever seen a gigantic jet? They are extremely rare but tremendously powerful. Gigantic jets are a type of lightning discharge documented only this century that occur between some thunderstorms and the Earth's ionosphere high above them. Pictured above is the middle and top of one such jet caught last week by a lightning and meteor camera from Puerto Rico, USA. The jet traversed perhaps 70 kilometers in just under one second. Gigantic jets are much different from regular cloud-to-cloud and cloud-to-ground lightning. The bottoms of gigantic jets appear similar in appearance to another type cloud-to-above strike called blue jets, while the tops appear similar to upper-atmosphere red sprites. Although the mechanism and trigger that causes gigantic jets is a topic of research, it is clear that the jets reduce charge imbalance between different parts of Earth's atmosphere. A good way to look for gigantic jets is to watch a powerful but distant thunderstorm from a clear locat...
Read more