Is an obstacle obscuring the EHT's view of Sagittarius A- star?
38088
Why was M87 targeted for the Event Horizon Telescope instead of Sagittarius A*?
126110
Do celestial objects experience drag from the near vacuum of space/does the near vacuum have a mean velocity?
20960
Seeing the shadow of a black hole
9671
Do gravitational lenses have a focus point?
35457
Weightlessness in Satellites
20711
How can I avoid star trails without an expensive tracking mount?
49040
Great-circle lines in Equirectangular projection
47968
Thought Experiment - Poking a stick across a Black Hole's Event Horizon
16777
Is there a limit to the resolving power of a mirror telescope?
99374
Can we observe an edge of the universe?
39242
Why can't we see light travelling from point A to B?
42372
Space Expansion vs. Relative Motion
50536
How is Starkiller Base's beam visible from Takodana in The Force Awakens?
87913
Could there be a star orbiting around a planet?
153552
Relativistic mass as seen by different observers
126355
Can we see emission lines in stars?
59077
Travel duration from Earth to a star at 9.8 m/s² acceleration