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NASA Astronomy Picture of the Day:

Is this star winking at us? The central object in today’s animation is not one but two stars. XZ Andromedae, indicated by the bold lines, is an Algol-type eclipsing binary with a nearly edge-on orbit from Earth’s perspective. The bottom light curve shows the amount of light from the system dim and brighten as the cooler star eclipses its hotter, brighter companion. Analysis of several XZ Andromedae light curves indicates there may be two other stars orbiting the system. This particular light curve was created with Citizen Astronomy, an open-source software for differential photometry. The software takes the difference in brightness between a target and comparison star and traces its behavior over time. This technique reduces most variations from the instrument and Earth’s atmosphere. In addition to eclipsing binaries, this analysis is useful for studying transiting exoplanets, accreting black holes, supernovae, and many more time-varying astronomical phenomena. Astrophotographers: try it out on your own data!

Watch NASA's Astronomy Video of the Day

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Featured Biography | Eleanor Roosevelt

Posted by Kronos Profile 09/09/26 at 01:00AM Biographies History See more by Kronos

Eleanor Roosevelt (1884 - 1962) | Kudos365 History Series  

First Lady, Humanitarian, and Champion of Human Rights

Eleanor Roosevelt transformed the position of First Lady of the United States and became one of the most influential advocates for human rights of the twentieth century. During more than five decades of public service, she worked for greater opportunities for women, improved conditions for workers and children, racial equality, assistance for refugees, and international cooperation. Her role in developing the Universal Declaration of Human Rights gave her work lasting worldwide significance.

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NASA Astronomy Picture of the Day:

Why are Saturn’s poles geometric? Saturn’s North Pole has been known to be surrounded by a hexagonal (6 sides) cloud since discovery in 1987 in data taken by NASA’s Voyager spacecrafts, which quickly flew past the ringed world in the early 1980s. Now, recent observations of Saturn by the Hubble Space Telescope reveal a slightly different geometric cloud pattern around the South Pole: a decagon (10 sides). The geometric boundaries are possibly caused by waves when the fast-moving gas away from the poles interacts with slower-moving gas closer to the poles. In the featured image composite by the Hubble taken last year, the South Pole of Saturn is marked by an X and surrounded by bands of circulating clouds. The decagon appears most prominent in the dark inner regions. The northern hexagon has proven stable for over 40 years, while the stability of the southern decagon will surely remain a topic of research. APOD's main NASA site is moving: From apod.nasa.gov to science.nasa.gov/apod

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How Humans Learned to Measure Time || Kudos365 History Series | The Past That Shaped Us

Time governs modern life so completely that it is difficult to imagine a world without clocks. Work begins at a stated hour, trains and airplanes depart by schedules, computers synchronize across continents, and scientific instruments measure intervals smaller than a billionth of a second. Yet for most of human history, people did not experience time as a sequence of precisely measured minutes and seconds. Learning to measure time was a gradual achievement spanning thousands of years—and it ultimately changed how societies organized work, travel, science, commerce, and everyday life. 

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