A gallery of gravitational lenses captured by NASA’s Hubble Space Telescope showcases the diversity of this cosmic phenomenon and lays the groundwork for follow-up observations by the new Nancy Grace Roman Space Telescope. Gravitational lensing, first predicted by Albert Einstein, occurs when the gravity of a massive foreground object, such as a galaxy or cluster
Voyager 1, the NASA space probe that has traveled farther from Earth than any other human-made object, is closing in on a remarkable milestone. Actually, let’s call it a 16.09-billion-milestone. That’s the distance a photon can travel in a single day, which is to say the Voyager 1 spacecraft will be exactly one light-day away
Australia’s broad-headed snake (Hoplocephalus bungaroides) is as unique as it is threatened. However, ecologists at the University of Technology Sydney (UTS) have good news about this reptile. According to researchers, four of six captive-bred juveniles recently released into the Australian bush have survived their initial, most dangerous months outdoors. The team’s first-of-its-kind program may provide
Pitt, M. M., Rosenzweig, M. R. & Gibbons, D. M. The determinants and consequences of the placement of government programs in Indonesia. World Bank Econ. Rev. 7, 319–348 (1993). Article Google Scholar Gertler, P. J. & Molyneaux, J. W. How economic development and family planning programs combined to reduce Indonesian fertility. Demography 31, 33–63 (1994).
Compared to ecosystems in many other parts of the world, the blanket bogs of the Flow Country in northern Scotland are unassuming—soggy, treeless landscapes dominated by hummocky mosses, grasses, and heathers. Yet, to ecologists, the seemingly desolate areas are nothing short of extraordinary. The bogs store tremendous quantities of carbon. That’s because their soils are
Explanation: Not all those who wander are lost. A night sky example is that planets wander, and in fact the very word “planet” comes from “wandering star” in Greek. As planets shift relative to fixed stars, they may appear from our perspective to get closer to other astronomical objects. Such meetings are called conjunctions. They