<commit_before>---
layout: article
title: "TIL - Astro"
modified: 2015-02-09
author: OctoMiao
toc: false
comments: true
categories: til
summary: Enceladus, Saturn's moon, could have alkaline ocean with pH in the range of 11 to 12.
---


## Alkaline Ocean on Enceladus

The ocean of Enceladus could have a ocean composed of Na-Cl-CO3, which is alkaline. This analysis is done using observational data from Cassini spacecraft. [^enceladus]



[^enceladus]: [arXiv:1502.01946, The pH of Enceladus' ocean](http://arxiv.org/abs/1502.01946)
<commit_msg>## Earth Has Quasi-satellites.<commit_after>---
layout: article
title: "TIL - Astro"
modified: {}
author: OctoMiao
toc: false
comments: true
categories: til
summary: "Earth has quasi-satellites."
published: true
---

## Earth Has Quasi-satellites.

Moon is not the only companion of Earth. 3753 Cruithne, for example, is on a quasi-satellite orbit of Earth. It orbits the sun but seen from earth the orbit is a bean like shape upon Earth.

![](https://upload.wikimedia.org/wikipedia/commons/c/c7/Horseshoe_orbit_of_Cruithne_from_the_perspective_of_Earth.gif)


## Alkaline Ocean on Enceladus

The ocean of Enceladus could have a ocean composed of Na-Cl-CO3, which is alkaline. This analysis is done using observational data from Cassini spacecraft. [^enceladus]



[^enceladus]: [arXiv:1502.01946, The pH of Enceladus' ocean](http://arxiv.org/abs/1502.01946)
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