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NASA astronaut Scott Kelly, who marked day 300 of a historic year in space on Jan. 21, 2016, shows off another fascinating feature of life in microgravity. Kelly used two paddles with hydrophobic, or water repellant, features to pass a sphere of water back and forth. Scientists use the microgravity environment of the space station to advance scientific knowledge in Earth, space, physical, and biological sciences that otherwise wouldn't be possible down here on the planet. The paddles are polycarbonate laser etched so that the surfaces are actually arrays of 300 micrometer posts (0.3mm). The surfaces were then spray coated with a Teflon coat. The combined effects of surface roughness and non-wettability produce a super-hydrophobic surface capable of preventing water adhesion in dynamic processes. The larger the drop, the less force it takes to break it up. The smaller the drop, the harder you can hit it. Scott is demonstrating about a 4 mL drop (over 100 times larger than a rain drop). Learn more and follow along with the one-year mission online or using #YearInSpace http://www.nasa.gov/oneyear Read more on 4K in space

For Earth Day 2021, we explore the connections of Earth systems and NASA's ability to observe them in a changing world, highlighting the links between dust transport, vegetation, water quality, conservation and human health, the cryosphere, and disasters. Music: "Ellipsis" and "Terrafirma" by Ben Niblett and Jon Cotton [PRS] via Universal Production Music Video credit: NASA's Goddard Space Flight Center Jefferson Beck (USRA): Lead Producer Ellen T. Gray (ADNET): Writer Sofie Bates (KBR): Writer Roberto Molar Candanosa (KBR): Writer This video can be shared and downloaded at https://svs.gsfc.nasa.gov/13842 . While the video in its entirety can be shared without permission, some individual imagery and music may have been obtained through permission and may not be excised or remixed in other products. Specific details on such imagery may be found here: https://svs.gsfc.nasa.gov/13842 . For more information on NASA’s media guidelines, visit https://nasa.gov/multimedia/guidelines . If you liked this video, subscribe to the NASA Goddard YouTube channel: https://www.youtube.com/NASAGoddard Follow NASA’s Goddard Space Flight Center · Instagram http://www.instagram.com/nasagoddard · Twitter http://twitter.com/NASAGoddard · Twitter http://twitter.com/NASAGoddardPix · Facebook: http://www.facebook.com/NASAGoddard · Flickr http://www.flickr.com/photos/gsfc

The Mercury transit of 2019 refers to the astronomical event where the planet Mercury passed directly between the Earth and the Sun, as observed from our perspective. This phenomenon is known as a transit and occurs when a planet's orbit aligns in such a way that it appears to cross the face of the Sun. The Mercury transit of 2019 took place on November 11th. It was visible from various parts of the world, depending on local time and weather conditions. Transits of Mercury are relatively rare events, occurring about 13 times per century on average, because of the specific alignment required between Earth, Mercury, and the Sun. During a transit, Mercury appears as a small dark dot moving slowly across the Sun's bright disk. This event is of interest to astronomers and space enthusiasts as it provides an opportunity to study Mercury's atmosphere and gather information about its position and movement with high precision. As always, it's important to exercise caution when observing the Sun directly, as looking at the Sun without proper eye protection can cause severe eye damage. Specialized solar viewing glasses or telescopic equipment with proper solar filters are necessary to safely observe events like Mercury transits.

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Allah O Akbar, Breathtaking view of thunder striking clock tower Makkah!