Tag: astronomy
Evidence that liquid water once existed on a comet
Scientists have found strong evidence that liquid water once existed in the interior of a comet.
The ripples in the rings of Saturn and Jupiter were caused by comets that hit them decades ago
The ripples in the rings of Saturn and Jupiter were caused by comet impacts decades ago.
A telescope a square kilometer in size
Looking inside red giant stars
Messenger in orbit around Mercury
Above, an annotated version of the first orbital image, showing areas of the south pole never before seen.
From the press conference about the first Messenger images from Mercury orbit:
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Which near-Earth asteroids are ripe for a visit?
Which near-Earth asteroids are ripe for a visit?
When is an Asteroid Not an Asteroid?
When is an asteroid not an asteroid?
The layered structure of Vesta (core, mantle and crust) is the key trait that makes Vesta more like planets such as Earth, Venus and Mars than the other asteroids, McCord said. Like the planets, Vesta had sufficient radioactive material inside when it coalesced, releasing heat that melted rock and enabled lighter layers to float to the outside. Scientists call this process differentiation.
This question immediately demonstrates once again the terrible mess the International Astronautical Union made when it decided several years ago to define what makes a planet, and came up with a definition that simply doesn’t work. For if Vesta should be considered a planet, why not Pluto?
The first image from Mercury orbit
The first image from Mercury orbit.
The brightest supernovae yet found
The brightest supernovae yet found.
Supernova 2008am is 3.7 billion light-years away. At its peak luminosity, it was over 100 billion times brighter than the Sun. It emitted enough energy in one second to satisfy the power needs of the United States for one million times longer than the universe has existed.
Quarter-mile diameter asteroid to pass only 200,000 miles from the Earth on November 8, 2011
Get those telescopes out! A asteroid, a quarter-mile in diameter, is going to pass only 200,000 miles from the Earth on November 8, 2011. Key quote:
Although classified as a potentially hazardous object, 2005 YU55 poses no threat of an Earth collision over at least the next 100 years. However, this will be the closest approach to date by an object this large that we know about in advance and an event of this type.
X-ray stripes in the expanding remnant of a supernova explosion
X-ray stripes in the expanding remnant of a supernova explosion.
Mining and jobs versus radio astronomy
Mining and jobs versus radio astronomy.
Dawn Opens its Eyes, Checks its Instruments
All systems go! Dawn did a camera and instrument checkout last week, in preparation for its summertime arrival at the asteroid Vesta.
Two stars caught fusing into one
Two stars fusing into one.
European Space Missions to Go It Alone After NASA Yanks Support
The mess from the NASA space war spreads: Three European space science missions are now on their own after the U.S. the space agency pulls funding.
Quake moved Japan coast 8 feet; shifted Earth’s axis
The earthquake moved Japan’s coast eight feet while shifting the Earth’s axis about four inches.
No, the “supermoon” didn’t cause the Japanese earthquake
No, the “supermoon” didn’t cause the Japanese earthquake.
David Lanz & Paul Speer – Ode to a Dark Star
An evening pause: The music is beautiful, but the images tell us how far astronomy has changed our perception of the universe in the last few decades.
An image of Apophis
Astronomers from the University of Hawaii have taken new images of the potentially dangerous asteroid Apophis in an effort to refine their understanding of its orbital path.