function articles
What are the two fundamental operations a telescope performs for the observer?
Which attribute of a telescope is considered its single most vital function?
If a telescope’s primary mirror diameter is doubled, what is the resulting change in its light-gathering capacity?
How is the magnification factor of a telescope calculated?
What is the typical maximum diameter of the aperture (pupil) in a human eye under bright conditions?
What is the consequence of using a very high-power eyepiece on a small telescope that has gathered limited light?
What defines a refracting telescope's method of manipulating incoming light rays?
What function, distinct from magnification, is governed by the quality of optics and aperture diameter, allowing separation of close objects?
Why are reflecting telescopes often favored over refractors when building instruments with very large apertures?
What is the general rule of thumb provided for determining the maximum useful magnification for an amateur telescope?
When did NASA officially declare the end of the Opportunity mission?
What was the date of the last signal received from the Opportunity rover?
What was the originally planned operational lifespan for Opportunity in Martian sols?
What natural Martian weather phenomenon unexpectedly contributed significantly to the rover's extended life?
What small, spherical geological feature did Opportunity find early on that suggested past liquid water?
Where were the clay minerals (phyllosilicates) discovered during the rover's later exploration?
On what specific date did Opportunity achieve the milestone of traveling the distance of a marathon on another celestial body?
What was the total distance recorded on Opportunity's odometer when communications ceased?
What was the measured opacity (tau) of the planet-encircling dust storm that ended Opportunity's mission?