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So, the recent conjunction of Jupiter and Venus seems to have spawned lots of excitement over this "rare" event. But what I can't figure out, is exactly how rare it...
Asked on 02/13/2021 by AdamMasters
4 answerWe are seeing stunning pictures of comet NEOWISE from earth (and ISS too), are there any pictures captured from Mars by an orbiter or rover, or any other spacecraft?...
Asked on 02/10/2021
1 answerMany sources state that fusion beyond iron-56/nickel-56 (and certainly beyond nickel-62) is impossible due to them being among the most tightly bound nuclei. For example, in the Wikipedia article on...
Asked on 02/10/2021 by HeatherB
1 answerBetween a moon and the primary, the equation for tidal heating is: $$dot E_mathit{Tidal} = - Im(k_2) frac{21}{2} frac{GM_h^2 R^5 n e^2}{a^6}$$ But how does one...
Asked on 02/09/2021 by SE - stop firing the good guys
1 answerI'm looking for some realistic data about the size (in meters) and mass (in kg) of a typical small asteroids that impact the Earth, without disintegrating in the atmosphere. Any...
Asked on 02/08/2021
2 answerIn observational cosmology people often measure and model cross-correlations between different tracer maps. There are generally two ways to measure cross-correlations:in real space (two-point function):$$xi^{uv}(theta) equiv leftlangle ...
Asked on 02/06/2021 by Astrolumos
0 answerIt is well known that diffraction resolution of a telescope depends on the exterior radius of aperture: One can, for instance, use just a narrow outer ring of a parabolic...
Asked on 02/04/2021 by Truffaldino
1 answerThe abstract of A magnetar parallax (also in MNRAS) says:TE J1810-197 (J1810) was the first magnetar identified to emit radio pulses, and has been...
Asked on 02/04/2021
0 answerThe smallest distance probed in any experiment so far conducted is $10^{-18}$m and the largest distance we can have is the radius of the universe, nearly $10^{26}$m. The...
Asked on 02/03/2021 by tarit goswami
3 answerEratosthenes experiment to find the circumference of the Earth is usually said to be performed on the Zero Shadow Day at Syene. Is it necessary? Can this experiment be performed...
Asked on 01/16/2021 by Chetan Waghela
2 answerGet help from others!
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