Justin Peter

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Laut berwarna biru karena cara air menyerap cahaya, partikel-partikel dalam air menyebarkan cahaya, dan juga karena sebagian cahaya biru dari langit dipantulkan. Flickr/Fiona Paton

Curious Kids: biru itu warna asli air atau hanya pantulan dari langit?

Justin Peter, Australian Bureau of Meteorology

Foton mengalir dari matahari dan berinteraksi dengan semua materi di Bumi. Tergantung cahaya jatuh dimana, beberapa foton akan diserap dan beberapa akan terpantul.
The sea is blue because of the way water absorbs light, the way particles in the water scatter light, and also because some of the blue light from the sky is reflected. Flickr/Fiona Paton

Curious Kids: is water blue or is it just reflecting off the sky?

Justin Peter, Australian Bureau of Meteorology

Photons stream from the sun and interact with all matter on Earth. Depending on what the light touches, some of the photons will get absorbed or soaked up. And some will bounce back.
Only clouds that are tall with big water drops can make rain, but they also stop most of the light, which makes them look grey. Marcella Cheng/The Conversation

Curious Kids: why does rain only come from grey clouds?

Justin Peter, Australian Bureau of Meteorology

To answer this question from Fiona, age 6, we need to know some things about clouds and light.
CERN’s work casts light on cloud formation, but might not have much to say about climate change. Taivasalla

Do cosmic rays influence climate? Some new results from CERN

Karl Braganza, Australian Bureau of Meteorology and Justin Peter, Australian Bureau of Meteorology

Physicists at CERN (the European Organization for Nuclear Research) created something of an online kerfuffle last month when they sought to improve our understanding of cosmic rays and clouds. While their…

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