Venus revealed in high-resolution radar images from Earth

10 March 2015 Astronomy Now

By combining the powerful radar transmitter of the Arecibo Observatory and the Green Bank Telescope (GBT) — the world’s largest fully steerable radio telescope — astronomers were able to penetrate the visually opaque atmospheric veil of Venus to make remarkably detailed images of the surface of the planet without leaving Earth.


See a 1-day-old Moon challenge

21 January 2015 Ade Ashford

What’s the youngest Moon you’ve ever seen? While the best opportunities generally occur in Northern Hemisphere spring when the ecliptic’s high, 21st January offers UK observers a 28-hour-old lunar crescent.