Fun Science Projects & Experiments
More Science Projects and Experiments
Science projects, videos and experiments for various grades and topics.
Science Projects or Science Experiments: Grades 4 & 5
Halley's Comet - P1
Halley's Comet or Comet Halley (officially designated 1P/Halley) is the most famous of the periodic comets, and is visible from Earth every 75 to 76 years. Many comets with long orbital periods may appear brighter and more spectacular, but Halley is the only short-period comet that is clearly visible to the naked eye, and thus, the only naked-eye comet that might appear twice in a human lifetime. During its returns to the inner solar system, it has been observed by astronomers since at least 240 BC, but it was only recognized as a periodic comet in the 18th century when its orbit was computed by English astronomer Edmond Halley, after whom it is named. Halley's Comet last appeared in the inner Solar System in 1986 and will next appear in mid-2061.
Halley's Comet - P2
During its 1986 apparition, Halley's Comet became the first to be observed in detail by spacecraft, providing the first observational data on the construction of the comet nucleus and the mechanism of tail formation. These observations supported a number of longstanding hypotheses about comet construction, particularly Fred Whipple's "dirty snowball" model, but also provided data which substantially reformed and reconfigured these ideas
Halley's Comet - P3
Rotate to landscape screen format on a mobile phone or small tablet to use the Mathway widget, a free math problem solver that answers your questions with step-by-step explanations.
You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.