User:Spooky31/Observational history of comets

Evaluation of article:

Short introduction that needs to be expanded.

body paragraphs are choppy and disorganized. Needs revision.

each claim is backed up with citations

What I can add:

Rearrange some of the information to make more sense

Maybe put them in chronological order

Add stuff about Tycho in his observations of comets

A real introduction

more photos

Articles:

https://books.google.com/books?hl=en&lr=&id=MHlfHcJ-Du4C&oi=fnd&pg=PA3&dq=scholarly+articles+for+early+comet+observations&ots=RUvutQdHd9&sig=QKt-xA4J7r3AfFIE2f9z2webTCw#v=onepage&q&f=false

https://academic.oup.com/mnras/article/339/4/1103/1007028

Christianson pdf

Add:

Intro: In the early years of comet observation, they were considered bad omens and always preceded disastrous or fatal events. As planetary theories became a large topic in astronomy, so did the scientific explanations for comets. Understanding why comets existed and what they were made of plagued early astronomers.

As the world grew older and science advanced, so did the knowledge on comets. Halley's comet was pivotal to the study of comets, especially in the study of orbits. Scientist like Immanuel Kant in the eighteenth century hypothesized about the physical composition of comets. Many different scientists and professors attempted to figure out the mystery of comets and it became a large area of study.

Today, scientists around the world have learned many things about comets like what they are composed of and how they orbit. Many of these observations were made before the 20th century. As new comets enter Earth's orbit, we continue to learn more about them.

The Rosetta Mission: The Rosetta mission was launched in early 2004 by the Guiana Space Centre in French Guiana. The mission for the Rosetta spacecraft was to follow a comet and collect data on it. Being the first spacecraft to orbit a comet, the goal was to understand the physical and chemical compositions of many aspects of the comet, observe the comets nucleus, as well as make connections about the solar system. The comet that the mission followed is called 67P/Churyumov–Gerasimenko and was discovered by Klim Ivanovich Churyumov and Svetlana Ivanova Gerasimenko. After making contact with the comet, many observations were made that changed what we knew about comets. A very surprising discovery is that as the comet travels, it releases an increasing amount of water vapor. That water is also different from that on Earth, being heavier because it contains more deuterium. This comet was also found to be made from a cold space cloud, which is why it is made of dust and ice loosely compacted. To investigate the nucleus of the comet, the Rosetta spacecraft passed radio waves through the comet. This experiment showed that the head of the comet was very porous. A computer model shows that there are many pits all over the comet that are very wide and deep. The composition of the comet led scientists to be able to infer the comet's formation. They believe it was a rather gentle formation as the comet is so loosely compacted. The mission lasted for over a decade and was a very important mission for the study of comets.