Why is light affected by gravity if photons are massless?

This post has been de-listed

It is no longer included in search results and normal feeds (front page, hot posts, subreddit posts, etc). It remains visible only via the author's post history.

Post Body

I recently watched the 700th episode of The Sky at Night. In this episode, viewers asked questions while Sir Patrick Moore and his guests provided answers. One question was, why are photons affected by gravity if they don't have mass? I was surprised that no one provided an answer, not even Brian Cox, who is a particle physicist and even works on the Large Hadron Collider at CERN. All they did was basically restate that light is affected by gravity and then moved on to the next question.

Can anyone here provide an answer, or is this something that is yet to be discovered?

Author

Account Strength

90%

Account Age

14 years

Verified Email

Yes

Verified Flair

Total Karma

594

Link Karma

413

Comment Karma

181

Profile updated: 1 day ago

Posts updated: 10 months ago

rpulkrabek

Subreddit

r/askscience

Post Details

We try to extract some basic information from the post title. This is not always successful or accurate, please use your best judgement and compare these values to the post title and body for confirmation.

Posted: 13 years ago
Reddit URL: View post on reddit.com
External URL: reddit.com/r/askscience/...