Archivo mensual: enero 2007

Sun’s fickle heart may leave us cold.

There’s a dimmer switch inside the sun that causes its brightness to rise and fall on timescales of around 100,000 years – exactly the same period as between ice ages on Earth. So says a physicist who has created a computer model of our star’s core. >>

Earth’s Moon Destined to Disintegrate

The Sun is midway through its stable hydrogen burning phase known as the main sequence. But when the Sun enters the red giant phase in around 5 billion years things are going to get a lot rougher in the Earth-Moon system.>>

New ‘Hobbit’ Galaxies Discovered Around Milky Way

A recent sky survey has turned up eight new members in our Local Group of galaxies, including a new class of ultra-faint "hobbit" galaxies and what might be the smallest galaxy ever discovered >>

Cometa McNaught.

El cometa McNaught se perfila como el más brillante de los útimos tiempos. A partir de hoy comienza a ser visto a simple vista.
La magnitud de un objeto del cielo, es una medida de su brillo, y a menor magnitud, mayor es el brillo. De esta manera, un objeto de magnitud cero, es más brillante que uno de magnitud diez. Como ejemplo, Venus tiene una magnitud de -1 (negativa) y eso lo hace el objeto más brillante del cielo luego del Sol y la Luna. Sirio, la estrella más brillante del cielo tiene una magnitud de cero.
El cometa tuvo magnitudes de -4 y hasta -5. Ahora que será visible desde el hemisferio Sur, lo hará con una magnitud de -1, como Venus.

NASA’s Pluto Probe Prepares for Jupiter Flyby

NASA’s New Horizons probe bound for Pluto is headed for a Jupiter flyby, its camera eyes wide open, in preparation for its swing out towards the fringe of the solar system. >>

Lightning balls created in the lab

The mystery of ball lightning could disappear in a flash, now that the glowing balls of light have been created in the lab. The most down-to-earth theory to date is that ball lightning forms when lightning strikes silica present in soil. Researchers tested the idea by zapping wafers of silicon between two electrodes, which created luminous orbs the size of ping-pong balls that hung around and bounced about before petering out. They are the longest-lived "lightning balls" ever made in the lab. Watch video of the balls in action…MORE

Listen to the Sounds of Titan!

The Planetary Society has teamed up with the European Space Agency and the Huygens Atmospheric Structure Instrument team to bring you the sounds recorded by the Huygens probe during its harrowing descent through Titan’s atmosphere. Here are the first sounds from Titan