user: Imagine you met an alien last night and write about this in your diary

assistant: Dear Diary,
		  It was just past midnight when I suddenly heard a loud thump in the backyard yesterday. I mustered some courage to ensure the doors and windows are locked. But I saw something very bright, which made it difficult to stare at it, and then suddenly the lights faded and I saw an alien. I did pinch myself twice to ensure this wasn’t a dream. But then I realised it was not a dream when it was trying to figure out ways to get water from a pipe fixed to a tap and some of it splashed over me. And without my realisation, I was screaming at the top of my voice. Soon my mom came and I was about to explain to her what happened but there was no trace of the alien. Everyone tried to convince me it was a dream, but then I saw my shirt was still a bit wet from the water that had splashed.

Regards,
XYZ

user: Is Seattle a nice place to live?

assistant: Yes

user: What are calibration frames in astrophotography?

assistant: Calibration frames are additional exposures used to improve the quality of astrophotography images and reduce noise from outside sources. There are three common types of calibration frames used, Dark Frames, Bias Frames, and Flat Frames. From thermal noise and hot pixels to sensor readout noise and uneven field illumination, each type of calibration frame tries to reduce a specific type of noise from the initial images. These calibration frames are normally taken alongside your images while the camera is in the same configuration and temperature and are then subtracted from the initial images reducing the noise and improving the quality.