Visibility articles
What is the approximate age of the Vredefort impact event?
Where is the Vredefort Dome structure located?
What was the estimated diameter of the transient crater created by the initial impact?
Which specific feature that remains visible today is the remnant of the initial central uplift?
What two geological fingerprints confirm the immense force involved in the impact?
Approximately how much overlying rock has been stripped away from the center of the structure by erosion?
What is the approximate diameter of the subtle, elliptical topographic feature visible today?
Why does Vredefort not look like a perfectly preserved bowl compared to younger impact sites?
What defines the subtle visibility of the dome from the ground today?
What characteristic visible in space imagery accounts for the structure's slightly elongated shape?
What is the current recognized status of the Vredefort structure due to its scientific significance?
Is there any location on Earth where the Moon never rises above the horizon permanently?
What geometrical factors are key to understanding extended lunar absence at the Earth's poles?
What causes the duration of continuous lunar absence or visibility at the poles to change over time?
For observers living outside the polar circles, approximately how much later does the Moon rise each day?
What is the primary reason people outside the poles might incorrectly believe the Moon is not visible?
What celestial mechanics concept explains why we always see the same face of the Moon from Earth?
If the Moon causes an extended absence at the pole, what is happening to its entire orbital path during that period?
How does the Moon's path appear to an observer looking from the geographic Pole ($90^ ext{o}$ N or S)?
Why is the New Moon phase universally the most globally non-visible phase?
What is the required condition for an observer at exactly $90^ ext{o}$ latitude to see the Moon during a cycle?
What effect does the Earth's curvature have on the Moon's visibility when it is very close to the horizon at lower latitudes?
What is the primary agent causing the erasure of the Milky Way view?
What visual feature is the Milky Way described as when viewed edge-on?
Approximately how much of the global population can no longer see the Milky Way?
What factor is fundamentally tied to the ability to see the Milky Way structure?
What term is often used for lighting designs that spill light horizontally or upward instead of focusing it down?
How much time must the human eye usually be allowed to adapt to darkness to register the galaxy's faint signature?
Which celestial phase should ideally be avoided when trying to observe the Milky Way?
Which of these is NOT listed as one of the three main principles for responsible lighting design?
What interacts with artificial light to create the luminous veil known as skyglow?
If current trends in artificial lighting continue, within how many decades are projections suggesting the visible stars could be largely erased for even more people?