In search of our origins
Understanding the origin of stars with ESA and ESO archival data, guided by ESA astrophysics.
1 points
The difference between horizon and equatorial coordinates is:
Horizon coordinates are dependent on the observer (i.e. local coordinates) and Equatorial coordinates are independent of the observer (i.e. global coordinates)
Horizon coordinates are independent on the observer (i.e. global coordinates) and Equatorial coordinates are dependent of the observer (i.e. local coordinates)
There is no difference between them
1 points
The method you would use to measure the distance to Jupiter is radar ranging whereas for a nearby star you would use parallax
True
False
1 points
Molecular clouds are made up of interstellar medium. The ISM is made up of:
Oxygen, hydrogen, dust
Gas (Hydrogen and Helium) and dust
Stars and planets
2 points
What causes molecular clouds to fragment into clumps? Select all that apply:
Gravity
Collapse
Accretion
3 points
What phenomena gives rise to the accretion disk? Select all that apply:
The constant movement of particles in the collapsing clump leads to rotation of the entire system
The molecular cloud is composed of metals
Conservation of angular momentum
The core is rotating and collapsing faster than the surrounding material
Protostar is cold
1 points
When is the main phase of accretion and what is the protostar at that stage called?
At 5 000 years after star formation has begun, the protostar at this stage is called classical T Tauri star
At 100 000 years, protostar at this stage is called classical T Tauri star
At 10 million years, protostar at this stage is called weak-line T Tauri star
1 points
Between two celestial objects, how would you tell which one is brighter in the night sky from their apparent magnitudes?
The objects with the lowest apparent magnitude will be brighter.
The object with the highest apparent magnitude will be brighter
The apparent magnitude is not related to brightness
The apparent magnitude is not related to luminosity (or insitrics brightness of the object divided by unit of surface)
1 points
How is colour in astronomy defined and why is it necessary to have a unique definition?
Colour has no clear definition and is dependent on the observer
Colour is defined as the difference between two magnitudes. A unique definition was necessary to avoid the subjectivity of colour
Colour in astronomy is not relevant
3 points
When looking for star formation regions, what types of emission do you look for? Select all that apply
H-alpha emission
Gamma rays
X-ray detection
Radio excess
Infrared excess
1 points
The scientific missions/telescopes one could use to explore star formation are those that span the range:
visible, UV and radio (i.e. VST, XMM-Newton, Planck)
infrared, far infrared and visible (i.e. 2MASS, Herschel, Gaia)
ultraviolet, visible and microwave (i.e. HST, VST, Planck)
visible, infrared, far infrared, X-rays (i.e. VST, Gaia, 2MASS, Herschel, XMM-Newton)
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