Parallax is the observed displacement of an object caused by the change of the observer's point of view. In astronomy, it is an irreplaceable tool for calculating distances of far away stars. When you ...
Simultaneous observations from two spatially well-separated telescopes can lead to the measurements of the microlensing parallax parameter, an important quantity toward the determinations of the lens ...
A wide open space (It could be your backyard or a park.) Two Hula-Hoops (Alternatively, you could use two flat rocks or bricks that you can sit on.) A yardstick or meterstick (Use one that has clear ...
Publications of the Astronomical Society of the Pacific, Vol. 133, No. 1029 (2021 November), pp. 1-9 (9 pages) Space-based observatories at the second Sun—Earth Lagrange Point (L2) offer a unique ...
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