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Stars look pointy because ... › Dr Karl's Great Moments In Science …
- https://www.abc.net.au/science/articles/2015/06/16/4253961.htm#:~:text=Whenever%20there%27s%20a%20star%20in%20the%20image%2C%20that,struts%20to%20land%20on%20the%20bigger%20main%20mirror.
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Optics Question: Why Do Stars (Hubble Photos) Appear 4 …
- https://boards.straightdope.com/t/optics-question-why-do-stars-hubble-photos-appear-4-pointed/657856
- This diffraction actually is what defines how small a point star can be focused to (and the big the lens the smaller the point but thats a different issue). Now imagine a lens that has lets say a wire runing across it. It will now have an image of a star that is a finite point. But it will also have some diffracted light perpendicular to the wire.
How do Hubble photos have that four-point effect on stars?
- https://www.reddit.com/r/askscience/comments/15jqrq/how_do_hubble_photos_have_that_fourpoint_effect/
- So I have a camera filter that can produce these effects in 4,6,8,etc points on light sources (water, streetlights, etc). Is there a filter like that on Hubble? If so, why? If not, why does it show up? Clarification: the effect makes a vertical and horizontal line intersecting light sources (stars).
Why do stars, when viewed with the Hubble telescope, …
- https://www.quora.com/Why-do-stars-when-viewed-with-the-Hubble-telescope-appear-as-points-of-light-and-not-streaks
- Because the secondary is usually positioned with four very thin support rods, light from bright point-sources, like stars, diffract around these support rods, producing visible spikes. See http://en.wikipedia.org/wiki/Diffraction_spike
Why do pictures of stars have 4 cardinal points? | Physics Forums
- https://www.physicsforums.com/threads/why-do-pictures-of-stars-have-4-cardinal-points.969480/
- Are there strong technical reasons why a telescope should have 4 rather than 6 diffraction rays? Depends on the number of supports for the secondary mirror and the brightness of the star here's one with 8 spikes generally refractors and reflectors like Schmitt Cassigrain's don't have spikes because there are no or no need for supporting vanes
Why are stars pointy? | (Diffraction spikes explained)
- https://wonderdome.co.uk/pointy-stars-diffraction-spikes-explained/
- Why do stars look spiky on Hubble photographs and appear spiky to our eyes? Do they really have “pointy bits” around them? No, of course they don’t! Astronomers call those bright spikes that we so often see around bright stars in astro-images DIFFRACTION SPIKES. These radial lines have to do NOT with the way a star shines, but with how we detect this starlight with our eyes or a …
Stars look pointy because ... › Dr Karl's Great Moments In …
- https://www.abc.net.au/science/articles/2015/06/16/4253961.htm
- Whenever there's a star in the image, that star has four points or spikes — even though it's a round little dot. Why? Because in the Hubble Space Telescope, the smaller secondary mirror is held in position by four cross hair-like struts, and the incoming light has to travel past these struts to land on the bigger main mirror.
Why do stars look like crosses in photographs?
- https://www.thenakedscientists.com/articles/questions/why-do-stars-look-crosses-photographs
- To do this they tend to have four struts, or supports, projecting out of the side of the telescope tube to hold it up. The "star" or cross shapes you see on images of the stars are a really out-of-focus picture of the support struts. This effect is also called a diffraction pattern.
The Surprisingly Complicated Reason Why Stars Look …
- https://www.smithsonianmag.com/smart-news/surprisingly-complicated-reason-why-stars-seem-have-points-180952587/
- Stars twinkle for a fairly intuitive reason: The movement of the air in Earth's atmosphere can momentarily dim a star's light. This is why, says NASA, stars on …
NASA - Hubble Views the Star That Changed the Universe
- https://www.nasa.gov/mission_pages/hubble/science/star-v1.html
- On the night of Oct. 5, 1923, Hubble began an observing run that lasted until the early hours of Oct. 6. Under poor viewing conditions, the astronomer made a 45-minute exposure that yielded three suspected novae, a class of exploding star. He wrote the letter "N," for nova, next to each of the three objects.
Truth Behind the Photos: What the Hubble Space …
- https://www.space.com/8059-truth-photos-hubble-space-telescope-sees.html
- The nearly 20-year-old Hubble Space Telescope has taken many iconic images of the cosmos and is even the star of a new 3D IMAX movie that gives viewers a chance to fly through those snapshots.
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