arecibo

A constant gravitational constant

Gravity, one of the four fundamental forces of nature, appears reassuringly constant across the Universe, according to a decades-long study of a distant pulsar. This research helps to answer a long-standing question in cosmology: Is…


Choose your new home

According to the Exoplanet Catalog maintained by the Planetary Habitability Laboratory (PHL) of the University of Puerto Rico at Arecibo, the number of confirmed planets outside our own solar system is approaching 1,000, while another…


A new asteroid cookie in town

A big asteroid that flew past Earth last month belongs to a new category of space rock, scientists say. Asteroid 1998 QE2 and its moon sailed within 3.6 million miles (5.8 million kilometers) of Earth…



A Cool Kid

Stars can be cool. In more than one sense: Astronomers using the world’s largest radio telescope, at Arecibo, Puerto Rico, have discovered flaring radio emission from an ultra-cool star, not much warmer than the planet…