The missing light crisis

We blogged about how new evidence is casting doubt on the existence of the universe.  Scientists have also discovered a massive discrepancy between the amount of light that we can detect and the amount of light produced by galaxies and quasars.  The two are off by a factor of some 400%.   Put another way, 80% of the light in the universe is missing.  This is being called the “missing light crisis.” [Read more...]

Like a diamond in the sky

Astronomers have discovered a white dwarf star–basically, the burnt-out remnant of a star–that basically consists of crystallized carbon.  In other words, diamond.  It’s a diamond the size of the earth.  “Twinkle, twinkle little star. . . .” [Read more...]

A near miss

On February 15, an asteroid of the size that struck this planet in the past, knocking out that forest in Siberia and making Meteor Crater in Arizona, will pass not only between the earth and the moon but between the earth and the orbit of some of our satellites. [Read more...]

Transit of Venus

A rare event will take place today, something that won’t happen again this century:  Venus will cross over the face of the Sun.

After Tuesday evening we sink into history’s pages, having witnessed a rare astronomical event: the Transit of Venus across the sun. This won’t repeat for 105 years.

Look to the west Tuesday evening, June 5, Venus begins to cross the sun at 6:04 p.m. EDT Tuesday evening, as a notch in the sun. By 6:22 p.m., from our perspective, Venus becomes a black dot moving across the solar disc.

On this transit, it’s a 6-hour, 40-minute trek for our neighboring, interior planet – and because the sun sets – we only see a few hours of this cosmic memory.

Venus transits occur in pairs, eight years apart, alternating between 105.5 years and 121.5 years apart. Tuesday’s transit is paired with the crossing that last occurred in June, 2004.

Here are the several preceding (and present) pairings, as documented by astronomer Roy Bishop, in the Observer’s Handbook 2012:

* 1631/1639 (each in December)

* 1761/1769 (June);

* 1874/1882 (December);

* none in the 20th century;

* 2004/2012 (June).

Looking ahead, the next pair won’t occur until Dec. 11, 2117 and Dec. 8, 2125.

For many cities in the eastern U.S., including Washington, the transit starts at 6:04 p.m. on Tuesday. The central and western time zones can see more of the transit, while Hawaii can see the whole event.

via Transit of Venus 2012: the last trip across the sun for 105 years – Capital Weather Gang – The Washington Post.

Don’t look at it with your bare eyes or you might burn your optic nerve.  You can watch it here.

I would add that when this happened in 1769, Captain James Cook was sent from England to the Western Hemisphere to study this event.  That voyage led to the “discovery” of Australia.  Capt. Cook would go on to “discover” Hawaii and Alaska.  (The quotation marks mean that I know that human beings already lived in these places, but Capt. Cook was the first European to find them and to open them up for colonization.)

 

The diamond planet

The universe is just full of wonders, and here is another one:

Astronomers have spotted an exotic planet that seems to be made of diamond racing around a tiny star in our galactic backyard.

The new planet is far denser than any other known so far and consists largely of carbon. Because it is so dense, scientists calculate the carbon must be crystalline, so a large part of this strange world will effectively be diamond.

“The evolutionary history and amazing density of the planet all suggest it is comprised of carbon — i.e. a massive diamond orbiting a neutron star every two hours in an orbit so tight it would fit inside our own Sun,” said Matthew Bailes of Swinburne University of Technology in Melbourne.

Lying 4,000 light years away, or around an eighth of the way toward the center of the Milky Way from the Earth, the planet is probably the remnant of a once-massive star that has lost its outer layers to the so-called pulsar star it orbits.

via Astronomers discover planet made of diamond | Reuters.


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