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A century of cepheids: Two astronomers, a hundred years apart, use stars to measure the universe

By Guest PostApril 29, 2018Sciencecepheid variables, constellation cepheus, Galaxy, henrietta leavitt, kate hartman, luminosity, measure the universe

National Harbor, MD—How far away is that galaxy?

Our entire understanding of the Universe is based on knowing the distances to other galaxies, yet this seemingly-simple question turns out to be fiendishly difficult to answer. The best answer came more than 100 years ago from an astronomer who was mostly unrecognized in her time—and today, another astronomer has used Sloan Digital Sky Survey (SDSS) data to make those distance measurements more precise than ever. (more…)

Zeitvergehen: Real, aber nur lokal

By Guest PostNovember 23, 2015Culture, Sciencedaniel saudek, douglas adams, Galaxy, gegenwarten, hitchhikers guide, nur lokal, philosoph, real, zeitvergehen

Die Vergangenheit ist „fix“ und unabänderlich, die Zukunft aber „offen“ und beeinflussbar. Seit Einstein wissen wir aber, dass es keine eindeutig definierte Gegenwart als „Trennlinie“ zwischen Vergangenheit und Zukunft gibt. Den scheinbaren Widerspruch zwischen Alltagserleben und Relativitätstheorie will der Philosoph Daniel Saudek lösen. (more…)

The water in your bottle might be older than the sun

By Guest PostOctober 23, 2014Scienceabsolute zero, alexander peltzer, astronomers, billion years, dresdner frauenkirche, erbgut, Galaxy, genom, george baehr, heavy water, kay nieselt, planet forming disk, ratio, solar system, university of michigan

ANN ARBOR — Up to half of the water on Earth is likely older than the solar system itself, University of Michigan astronomers theorize.

The researchers’ work, published in the current issue of Science, helps to settle a debate about just how far back in galactic history our planet and our solar system’s water formed. Were the molecules in comet ices and terrestrial oceans born with the system itself—in the planet-forming disk of dust and gas that circled the young sun 4.6 billion years ago? Or did the water originate even earlier—in the cold, ancient molecular cloud that spawned the sun and that planet-forming disk? (more…)

Heritage of Earth’s water gives rise to hopes of life on other planets

By Guest PostOctober 21, 2014Scienceearth, erforschen, evolution of life, exoplanetary systems, exoplanets, Galaxy, gehirnaktivitaet, ilsedore cleeves, magnetfelder im gehirn, momoko watanabe, schlaganfall, stars, university of exeter, university of michigan, water, zika infected organoids

A pioneering new study has shown that water found on Earth predates the formation of the sun – raising hopes that life could exist on exoplanets, the planets orbiting other stars in our galaxy.

The ground-breaking research set out to discover the origin of the water that was deposited on the Earth as it formed.

It found that a significant fraction of water found on Earth, and across our solar system, predates the formation of the sun. By showing that water is ‘inherited’ from the environment when a star is born, the international team of scientists believe other exoplanetary systems also had access to an abundance of water during their own formation. (more…)

The source of the sky’s X-ray glow

By Guest PostSeptember 21, 2014Scienceaircraft designer, der kakadu, earth, Galaxy, light years, NASA, network theory, parisite la, proximity, rijeka, robert bartini, schlaue voegel, sergei korolev, sky, solar system, source, university of michigan, yury gagarin

ANN ARBOR — In findings that help astrophysicists understand our corner of the galaxy, an international research team has shown that the soft X-ray glow blanketing the sky comes from both inside and outside the solar system.

The source of this “diffuse X-ray background” has been debated for the past 50 years. Does it originate from the solar wind colliding with interplanetary gases within our solar system? Or is it born further away, in the “local hot bubble” of gas that a supernova is believed to have left in our galactic neighborhood about 10 million years ago? (more…)

The Most Precise Measurement of an Alien World’s Size

By Guest PostAugust 5, 2014Scienceaccelerator program, alien world, exoplanets, Galaxy, infrared light, kenya lab, kepler, NASA, size, solar system, spitzer space telescope, super earth, ted fellow

Thanks to NASA’s Kepler and Spitzer Space Telescopes, scientists have made the most precise measurement ever of the radius of a planet outside our solar system. The size of the exoplanet, dubbed Kepler-93b, is now known to an uncertainty of just 74 miles (119 kilometers) on either side of the planetary body.

The findings confirm Kepler-93b as a “super-Earth” that is about one-and-a-half times the size of our planet. Although super-Earths are common in the galaxy, none exist in our solar system. Exoplanets like Kepler-93b are therefore our only laboratories to study this major class of planet. (more…)

Nearest Bright ‘Hypervelocity Star’ Found

By Guest PostJune 11, 2014Scienceastronomers, Beijing, black hole, China, dark matter, earth, ella nukarinen, energiestoffwechsel, erwin schroedinger, Galaxy, gravity, Milky Way, thomas naegele, university of utah, valentin roustan, wolfram weckwerth, zentrale regulationsnetzwerk

Speeding at 1 Million mph, It Probes Black Hole and Dark Matter

A University of Utah-led team discovered a “hypervelocity star” that is the closest, second-brightest and among the largest of 20 found so far. Speeding at more than 1 million mph, the star may provide clues about the supermassive black hole at the center of our Milky Way and the halo of mysterious “dark matter” surrounding the galaxy, astronomers say. (more…)

Astronomers Find Sun’s ‘Long-Lost Brother,’ Pave Way for Family Reunion

By Guest PostMay 13, 2014Scienceastronomer, austin, bisphosphonates, cause of osteoporosis, Chile, email marketing, extraterrestrial life, family reunion, Galaxy, harlan j smith, margaret, Milky Way, newsletter, nukleationstheorie, sanc messsystem, sun, telescope, umweltphysik, university of texas

AUSTIN, Texas — A team of researchers led by astronomer Ivan Ramirez of The University of Texas at Austin has identified the first “sibling” of the sun — a star almost certainly born from the same cloud of gas and dust as our star. Ramirez’s methods will help astronomers find other solar siblings, which could lead to an understanding of how and where our sun formed, and how our solar system became hospitable for life. The work appears in the June 1 issue of The Astrophysical Journal.

“We want to know where we were born,” Ramirez said. “If we can figure out in what part of the galaxy the sun formed, we can constrain conditions on the early solar system. That could help us understand why we are here.” (more…)

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