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The AstronomersDr
Videos with tag Dr
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05:00
05:00
05:00

Interview with a Scientist - Dr. Charles H. Lineweaver

Short interview with Dr. Charlie Lineweaver from the planetary science institute of the Australian National University, talking about some of his astrobiology research.

Channels: Planetary science 

Added: 1969 days ago by deek

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05:09
05:09
05:09

ESO 20 Richest eXoPlanetary System Ever [HD] Discovered by HARPS (not HAARP!)

~credits video: http://youtube.com/ESOobservatory Astronomers using ESO instruments have discovered a remarkable extrasolar planetary system that has some striking similarities to our own Solar System. At least five planets are orbiting the Sun-like star HD 10180, and the regular pattern of their orbits is similar to that observed for our neighbouring planets. One of the new extrasolar worlds could be only 1.4 times the mass of the Earth, making it the least massive exoplanet ever found. This video podcast explains how these faraway planets were detected and exactly what we know about them. Astronomers using ESO's world-leading HARPS instrument have discovered a planetary system containing at least five planets, orbiting the Sun-like star HD 10180. The researchers also believe the system has two other planets, one of which would have the lowest mass ever found, making the system similar to our own Solar System in terms of the number of planets. Furthermore, the scientists find that the location of the planets follows a regular pattern, as also seen in our own Solar System The team of astronomers used the HARPS spectrograph, attached to ESO's 3.6-metre telescope at La Silla, Chile. HARPS is an instrument with unrivalled stability and great precision, and the world's most successful exoplanet hunter. The astronomers, led by Christophe Lovis from the Geneva Observatory, studied the Sun-like star HD 10180 over a period of six years! This star is located 127 light-years away in the southern constellation Hydrus ("the Male Water Snake"). Thanks to the 190 individual HARPS measurements, the astronomers detected the wobbles of the star caused by five or more planets. The five strongest signals correspond to planets with Neptune-like masses — between 13 and 25 Earth masses — which orbit the star in between 6 to 600 days. The astronomers have also strong reason to believe that two other planets are present. One would be a Saturn-like planet orbiting in 2200 days. The other, having a mass of only about 1.4 times that of the Earth would be the least massive exoplanet ever discovered. This suspected planet is very close to its host star and so it is likely to be very hot. One 'year' on this planet lasts only 1.18 Earth-days! The newly discovered Solar System is unique in several respects. First of all, with at least five Neptune-like planets lying within a distance equivalent to the orbit of Mars, this system is more populated than our own Solar System in its inner region, and has many more massive planets there. Furthermore, the system probably has no Jupiter-like gas giant. In addition, all the planets seem to have almost circular orbits. Dynamical studies of the new system reveal complex interactions between planets and give us insights into its long-term evolution. Using the new discovery as well as data for other planetary systems, the astronomers discovered that the locations of the planets seem to follow a regular pattern — similar to the "Titius-Bode" law that exists in our Solar System. This could be a general signature of how planetary systems form. Another important result is that all very massive planetary systems are found around massive and metal-rich stars, while the four lowest-mass systems are found around lower-mass and metal-poor stars. These properties confirm current theoretical models. There is no doubt that this remarkable discovery highlights the fact that we are now entering a new era in exoplanet science: the study of complex planetary systems and not just of individual planets!! And with HARPS, European astronomers will be a driving force behind this transition. --- ESOcast is produced by ESO, the European Southern Observatory. ESO, the European Southern Observatory, is the pre-eminent intergovernmental science and technology organisation in astronomy designing, constructing and operating the world's most advanced ground-based telescopes. • http://eso.org

Channels: Planetary science 

Added: 2004 days ago by deek

Views: 1287 | Comments: 0

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04:25
04:25
04:25

ESOcast 35: Fifty New Exoplanets

Astronomers using ESO's leading exoplanet hunter HARPS have today announced more than fifty newly discovered planets around other stars. Among these are many rocky planets not much heavier than the Earth. One of them in particular seems to orbit in the habitable zone around its star. This ESOcast we look at how astronomers discover these distant worlds and what the future may hold for finding rocky worlds like the Earth that may support life. Credits and download options are available on: http://www.eso.org/public/videos/eso1134a/

Channels: Planetary science 

Added: 2004 days ago by deek

Views: 649 | Comments: 0

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02:03
02:03
02:03

Atoms and the Periodic Table (1 of 15)

Episode 1 of In Search of Giants: Dr Brian Cox takes us on a journey through the history of particle physics. In this episode we learn that the Greeks knew about atoms and how Mendeleyev's periodic table was among the first clues that the atom had a deeper structure. This film is part of a series originally broadcast on Teachers' TV (http://www.teachers.tv/video/23645). The series was made with the support of The Science and Technology Facilities Council (www.scitech.ac.uk). www.lhc.ac.uk - Official UK LHC website for public and schools. www.particledetectives.net - School resources on the LHC, how science works and particle physics. Films produced and directed by Alom Shaha (www.labreporter.com).

Channels: The Astronomers 

Added: 2846 days ago by deek

Views: 766 | Comments: 0

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03:28
03:28
03:28

The Discovery of the Atomic Nucleus (3 of 15)

Episode 3 of In Search of Giants: Dr Brian Cox takes us on a journey through the history of particle physics. In this episode we learn how Ernest Rutherford conducted a historical experiment that revealed that most of the mass of an atom is concentrated in a tiny nucleus made of protons and neutrons. This film is part of a series originally broadcast on Teachers' TV (http://www.teachers.tv/video/23645). The series was made with the support of The Science and Technology Facilities Council (www.scitech.ac.uk). www.lhc.ac.uk - Official UK LHC website for public and schools. www.particledetectives.net - School resources on the LHC, how science works and particle physics. Films produced and directed by Alom Shaha (www.labreporter.com).

Channels: The Astronomers 

Added: 2846 days ago by deek

Views: 709 | Comments: 0

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