Sarah Wild
Latest articles by Sarah Wild
![image of Earth during equinox from space showing the left half in shadow and the right half in light.](https://cdn.mos.cms.futurecdn.net/pczk8WPaHmVCrxmJzm6JHm-320-80.jpg)
What is an equinox?
By Sarah Wild last updated
Reference Equinoxes occur twice a year when the sun is directly above the equator, and signal herald the beginning of spring and autumn.
![NASA astronaut Michael Hopkins celebrating the announcement in August 2018 that he would be flying to the International Space Station on the first full-fledged mission of the SpaceX Crew Dragon.](https://cdn.mos.cms.futurecdn.net/gpWnp9tiNDYDQNhE8vG2ef-320-80.jpg)
Michael Hopkins: NASA astronaut and SpaceX Crew Dragon commander
By Sarah Wild published
A brief summary of Michael Hopkins' career in the Air Force and at NASA.
![Photo of NASA astronaut Shannon Walker in a blue flight suit with American flag patch on the sleeves. She is crossing her arms and smiling at the camera.](https://cdn.mos.cms.futurecdn.net/rh2XGuy6EzBwcKajyz2Bi5-320-80.jpeg)
Shannon Walker: NASA astronaut and SpaceX Crew Dragon mission specialist
By Sarah Wild last updated
Here's a summary of Shannon Walker's career.
![How Glacial Biomarkers Can Hone the Search for Extraterrestrial Life](https://cdn.mos.cms.futurecdn.net/3idigGhK4cntvCHArvt3b6-320-80.jpg)
How Glacial Biomarkers Can Hone the Search for Extraterrestrial Life
By Sarah Wild published
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