Loading...

Documents & Resources - Search Results

 

Your search produced 82 results
Click here to scroll to results

Hide filtering options

Filter results

 

 

 

 

 

 

Search results

A series of light and dark rings that resemble an archery target around the star TW Hydrae

Planet formation around the star TW Hydrae

image

Caption: This image shows the disk around the young star TW Hydrae. This star is only about 10 million years old, young enough that planets are still forming in a disk of gas and dust around it. This image was created using an array of submillimetre telescopes, each of which looks like a satellite dish. The signals from these telescopes were combined by a central processing computer to make this image. The lighter and darker patches show areas of the disk where there is more or less dust respectively. The dark rings and bright rings are evidence that the dust in the disk has been shepherded into some orbits and away from others. This is likely because there is one or more planets that are still forming hidden in the disk. The whole image shows the disk around TW Hydrae out to a distance of about 70 astronomical units frm the central star. The two outer dark rings are separated from the central star by approximately the average distance between the Sun and Uranus and the average distance between the Sun and Pluto. The inner central hole appears to have been carved out by a planet orbiting TW Hydrae at a distance similar to the distance between the Earth and the Sun.
Credit: S. Andrews (Harvard-Smithsonian CfA); B. Saxton (NRAO/AUI/NSF); ALMA (ESO/NAOJ/NRAO)
Credit Link

Glossary Terms: Planet Formation
Categories: Exoplanets & Astrobiology

License: Creative Commons Attribution 4.0 International (CC BY 4.0) Creative Commons Attribution 4.0 International (CC BY 4.0) icons

File ( image 210.48 kB)


A bright oval with a dark circle in the center. To the right of the dark circle but still inside the oval is a bright dot.

The planet PDS 70b inside a protoplanetary disk

image

Caption: An image of the planet PDS 70b. The young star PDS 70b has a protoplanetary disk surrounding it. Disks like these contains gas, fine sandy particles that astronomers refer to as dust and also larger bodies ranging from objects the size of pebbles to protoplanets (planets that are still forming). This image was taken in infrared light using adaptive optics. Adaptive optics is a technique that uses flexible mirrors and computer analysis to remove the blurring effect of the Earth's atmosphere. This allows astronomers to search regions close to stars like PDS 70 that would otherwise be swamped by light from the star spread out by the Earth's atmosphere. In the center is a black circle. This is caused by a coronograph, a small circle that blocks out light from the parent star. This is surrounded by a bright oval, infrared light emitted from the material in the protoplanetary disk. To the right of the black circle covering the star is a bright dot. This is PDS 70b, a giant planet that is still forming .
Credit: ESO/ A. Müller, MPIA
Credit Link

Glossary Terms: Planet Formation , Protoplanet , Protoplanetary Disk , Adaptive Optics
Categories: Exoplanets & Astrobiology

License: Creative Commons Attribution 4.0 International (CC BY 4.0) Creative Commons Attribution 4.0 International (CC BY 4.0) icons

File ( image 1.59 MB)



The planet beta Pictoris b is a bright dot close to its parent star. Around this we see a warm disk edge-on

beta Pictoris b

image

Caption: This composite of two images shows the planet beta Pictoris b and a disk of material both of which orbit the young star beta Pictoris. Both are taken in infrared light. The inner image was one of the first pictures taken of a planet around another star (an exoplanet). This image was made using a technique called adaptive optics which removes the blurring effect of the Earth's atmosphere that spreads out a star's light. The star's light is then concentrated tightly enough that it can be hidden behind a blocking circle (shown here in black) called a coronagraph. The ripples around this are artifacts of the imaging process. Beta Pictoris b, a gas giant planet about twelve times the mass of Jupiter, appears as a dot above and to the left of the black circle. The outer image shows the thermal emission from the warm disk of material surrounding the young star beta Pictoris. As we are viewing this disk edge-on it appears as a line. This disk of gas and dust provided the material to form beta Pictoris b.
Credit: ESO/A.-M. Lagrange et al.
Credit Link

Glossary Terms: Exoplanet , Planet Formation , Adaptive Optics
Categories: Exoplanets & Astrobiology

License: Creative Commons Attribution 4.0 International (CC BY 4.0) Creative Commons Attribution 4.0 International (CC BY 4.0) icons

File ( image 128.05 kB)


A map with the red prime meridian line running through London & crossing the darker horizontal equator in the Gulf of Guinea.

The Prime Meridian

image

Caption: The prime meridian is defined as zero degrees longitude and runs from the North Pole through Greenwich in London to the South Pole. It is represented as a bright red line on this schematic Earth map. The horizontal line corresponds to the equator, while the antimeridian itself forms the outer edges at 180 degrees to the west and east.
Credit: Wikicommons user Kmf164
Credit Link

Glossary Terms: Equator , Prime Meridian
Categories: Planet Earth

License: Public Domain Public Domain icons

File ( image 563.81 kB)


First Previous Page 2 of 17 Next Last