8 Feb 2021

The Wonderful World Of Physics: What Is Rainbow Astronomy?

Physics

Dr Jen Gupta is an astrophysicist (someone who uses physics to understand space) at The Institute of Cosmology and Gravitation at the University of Portsmouth who spoke to Stemettes on the 24th of August to discuss astronomy, light, and accessibility within the field.

It may be a little confusing to understand the physics behind light and rainbows. Simply, the light we see as white is a mixture of all the colours of the rainbow. If you shine this light through a glass prism, the light slows down and bends, causing the colours to spread out into a spectrum. This spectrum is all the colours we can see and is called the visible light spectrum. This spreading also occurs when we see rainbows.

rainbow gif | Stemettes Zine
giphy

The field of cosmology, as Dr Gupta states, is both an accessible and inaccessible field at the same time. Anyone with good vision can observe the stars and the night sky, however, not everyone has had an equal chance of recognition in the field. Because of this, Jen wants to illuminate these women who have made a significant contribution to the field:

  1. Lady Margaret Huggins. She was a scientist in the late 19th century who worked with her husband to pioneer spectroscopy. However, Lady Margaret was often known as her husbands assistant even though she made a significant contribution to the work, including a book called An Atlas of Retrospective Stellar Spectre which was used by many. Read more about Lady Margaret here >>
  2. Annie Jump Cannon worked hard to categorise the spectre created by Lady Margaret Huggins. Read more about Annie here >>
  3. Cecilia Payne discovered the physics of why different stars fit into different categories. Read more about Cecilia here >>
  4. Vera Rubin found the first evidence of dark matter. Read more about Vera here >>
Vera Rubin gif | Stemettes Zine
giphy

Also, by using the hashtag ‘#blackinastro’ on Twitter, you can find lots of POC Astronomer role models.

Science should be as accessible as possible, and because of this, Dr Jen Gupta gave us some instructions on how to make our own spectroscope at home. Here’s how:

  1. Gather basic materials including an old CD, an old cereal box or kitchen roll tube, and some scissors.
  2. Create a slit in the box.
  3. insert the cd into this slit.
  4. create another slit to let light in.
  5. cut out a viewing hole.

Always get assistance and permission from parents or guardians before trying this yourself.

Catch Up Issue 35 Physics
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