Please wait, while we are loading the content...
Please wait, while we are loading the content...
Content Provider | NASA - Spitzer Space Telescope |
---|---|
Organization | NASA |
Organization | JPL-Caltech |
Description | Using the Spitzer Space Telescope, astronomers are probing the chemistry of circumstellar disks, the dusty disks that surround stars, to understand the first moments in planetary life. Spitzer has turned its ultra-sensitive infrared spectrograph instrument toward five young stars in the constellation Taurus. These stars are still surrounded by thick, dusty disks -- relics of the gravitational collapse that formed them only a few million years ago. The five disks have similar chemistry, indicating dusty material rich in silicates and organic compounds, as well as both water and carbon dioxide ices. Despite their similarities, there are also intriguing differences between the disks that may hold important clues about the evolution of stars and their young planetary systems. In this animation, we focus on the disk of a young star. Light from the star is almost completely blocked by the thick dust and is seen only when it scatters off dust and gas above the disk plane. Delving in closer, we observe that the disk is composed of countless tiny grains of dust, some of which, according to Spitzer observations, have crystal structures. These dust grains may serve as the first building blocks of new planets, accreting into larger and larger bodies, as time progresses. As a few of these crystals fill our view, a strange metamorphosis takes place. Ice, already known to be present in these disks, begins to condense onto the surface of the crystals. Over time, the grains become larger, icier and more spherical. These chemical and physical changes in the dust grains may explain the differing spectral characteristics of the disks, and may also serve as a marker of the age and evolutionary stage of protoplanetary, or planet-forming, disks. |
Alternate Link(s) | https://www.youtube.com/embed/6E2hKe3tVUs?rel=0&showinfo=0&loop=1&playlist=6E2hKe3tVUs |
Youtube | 6E2hKe3tVUs |
Language | English |
Access Restriction | Open |
Content Type | Video |
Resource Type | Video Lecture |
Subject | Astronomy & allied sciences |
National Digital Library of India (NDLI) is a virtual repository of learning resources which is not just a repository with search/browse facilities but provides a host of services for the learner community. It is sponsored and mentored by Ministry of Education, Government of India, through its National Mission on Education through Information and Communication Technology (NMEICT). Filtered and federated searching is employed to facilitate focused searching so that learners can find the right resource with least effort and in minimum time. NDLI provides user group-specific services such as Examination Preparatory for School and College students and job aspirants. Services for Researchers and general learners are also provided. NDLI is designed to hold content of any language and provides interface support for 10 most widely used Indian languages. It is built to provide support for all academic levels including researchers and life-long learners, all disciplines, all popular forms of access devices and differently-abled learners. It is designed to enable people to learn and prepare from best practices from all over the world and to facilitate researchers to perform inter-linked exploration from multiple sources. It is developed, operated and maintained from Indian Institute of Technology Kharagpur.
Learn more about this project from here.
NDLI is a conglomeration of freely available or institutionally contributed or donated or publisher managed contents. Almost all these contents are hosted and accessed from respective sources. The responsibility for authenticity, relevance, completeness, accuracy, reliability and suitability of these contents rests with the respective organization and NDLI has no responsibility or liability for these. Every effort is made to keep the NDLI portal up and running smoothly unless there are some unavoidable technical issues.
Ministry of Education, through its National Mission on Education through Information and Communication Technology (NMEICT), has sponsored and funded the National Digital Library of India (NDLI) project.
Sl. | Authority | Responsibilities | Communication Details |
---|---|---|---|
1 | Ministry of Education (GoI), Department of Higher Education |
Sanctioning Authority | https://www.education.gov.in/ict-initiatives |
2 | Indian Institute of Technology Kharagpur | Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project | https://www.iitkgp.ac.in |
3 | National Digital Library of India Office, Indian Institute of Technology Kharagpur | The administrative and infrastructural headquarters of the project | Dr. B. Sutradhar bsutra@ndl.gov.in |
4 | Project PI / Joint PI | Principal Investigator and Joint Principal Investigators of the project |
Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon |
5 | Website/Portal (Helpdesk) | Queries regarding NDLI and its services | support@ndl.gov.in |
6 | Contents and Copyright Issues | Queries related to content curation and copyright issues | content@ndl.gov.in |
7 | National Digital Library of India Club (NDLI Club) | Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach | clubsupport@ndl.gov.in |
8 | Digital Preservation Centre (DPC) | Assistance with digitizing and archiving copyright-free printed books | dpc@ndl.gov.in |
9 | IDR Setup or Support | Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops | idr@ndl.gov.in |