A nearly full Rhea shines in the sunlight in this recent Cassini image. Rhea (949 miles, or 1,527 kilometers across) is Saturn’s second largest moon.
Lit terrain seen here is on the Saturn-facing hemisphere of Rhea. North on Rhea is up and rotated 43 degrees to the left. The image was taken in visible light with the Cassini spacecraft narrow-angle camera on Sept. 10, 2013.
The view was obtained at a distance of approximately 990,000 miles (1.6 million kilometers) from Rhea. Image scale is 6 miles (9 kilometers) per pixel.
The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA’s Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colo.
Image Credit: NASA/JPL-Caltech/Space Science Institute
This lost classic was first published anonymously in 1902 by the Social Science Club of Philadelphia, whose members included Voltairine de Cleyre, Mary Hansen, Natasha Notkin, and other Mutualists, Individualists, and Communists from the Philadelphia social movement. The “Catechism,” drafted by Hansen and finished by the Club collectively, presents a dialogue on the fundamentals of Anarchistic philosophy; discusses the commonality and the disagreements among Socialist, Individualist, Communist, and Mutualist forms of Anarchism; and offers a pluralistic, experimental vision of the free society, in which free people can try out any peaceful economic arrangement, and in which a wealth of Anarchistic economic systems peacefully co-exist, compete, and flourish side-by-side.“What is Civil Authority? – That force which interferes with our daily actions, making and punishing criminals, commonly called government. How does Government make Criminals? – By fostering an unjust system of distribution, wherein one man is dependent on another for his subsistence; failing to secure it he is forced to resort to crime, for which, again, the government punishment. . . .
“How would the Abolition of Government effect Economic Justice?– The force which protects the owners of the great natural sources of production and means of exchange being removed, people would be free to experiment and discover what economic arrangement was best, instead of being compelled to accept the decision of the ruling majority or minority. . . .
“Does Anarchism teach Violence? – Anarchism is the negation of violence. By removing the causes, it would make the recurrence of acts of violence almost, and in time wholly, obsolete . . . .
The inhabitants of the structures S and S* are extracting rotational energy from the “black hole”
Illustration by Roger Penrose
Mae Jemison, Jeanette J. Epps, Joan Higginbotham, Yvonne Cagle, Stephanie Wilson, and finally Nichelle Nichols, she is not an astronaut, but she starred in Star Trek, becoming inspiration for a lot of African American women to become astronauts and astrophysicists
On Aug. 3, 2004, NASA’s Mercury Surface, Space Environment, Geochemistry, and Ranging (MESSENGER) spacecraft began a seven-year journey, spiraling through the inner solar system to Mercury. One year after launch, the spacecraft zipped around Earth, getting an orbit correction from Earth’s gravity and getting a chance to test its instruments by observing its home planet.
This image is a view of South America and portions of North America and Africa from the Mercury Dual Imaging System’s wide-angle camera aboard MESSENGER. The wide-angle camera records light at eleven different wavelengths, including visible and infrared light. Combining blue, red, and green light results in a true-color image from the observations. The image substitutes infrared light for blue light in the three-band combination. The resulting image is crisper than the natural color version because our atmosphere scatters blue light. Infrared light, however, passes through the atmosphere with relatively little scattering and allows a clearer view. That wavelength substitution makes plants appear red. Why? Plants reflect near-infrared light more strongly than either red or green, and in this band combination, near-infrared is assigned to look red.
Apart from getting a clearer image, the substitution reveals more information than natural color. Healthy plants reflect more near-infrared light than stressed plants, so bright red indicates dense, growing foliage. For this reason, biologists and ecologists occasionally use infrared cameras to photograph forests.
Image Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington
Caption: Holli Riebeek