Science on This Day: 9 November | Carl Sagan, the Great Northeast Blackout and Apollo 4
Science history can help students connect ideas from the classroom with the people, technologies and events that have shaped the modern world. The events of 9 November provide three particularly useful examples: the birth of astronomer and science communicator Carl Sagan, the 1965 Northeast US blackout, and the launch of Apollo 4 in 1967.
These stories span astronomy, electrical engineering and space exploration. They also raise questions about how we communicate scientific ideas, how complex systems can fail, and why testing is essential when technology has to work reliably in demanding conditions.
For middle and high school science teachers, each event can become a short lesson starter, a discussion prompt or a link to a larger topic. You do not need to spend an entire lesson on science history to give students a useful opportunity to think, question and make connections.
1. Carl Sagan: making planetary science accessible
Carl Sagan was born on 9 November 1934. His work as an astronomer and science communicator helped millions of people engage with planetary science and the search for life beyond Earth. Through research and public communication, he helped bring questions about planets, the wider universe and our place within it to audiences well beyond the scientific community.
Sagan's legacy provides an opportunity to discuss an important part of science that students do not always consider: communicating evidence clearly. Scientific knowledge is useful not only when researchers make discoveries, but also when those discoveries can be explained accurately to other people. A good explanation can make a difficult idea understandable without removing the important details or exaggerating what scientists know.
This distinction matters when students encounter science in videos, news articles, social media posts and classroom resources. An engaging explanation should encourage curiosity while remaining faithful to the evidence. It should also make clear when a question remains unanswered.
Classroom connection: How do you make science engaging without losing accuracy?
Ask students to choose a scientific idea they have recently studied, such as the scale of the Solar System, the conditions needed for life, or the evidence for climate change. Challenge them to explain it in two or three sentences for someone younger than themselves.
They can then review their explanation. Have they kept the key scientific idea intact? Have they used an analogy that might accidentally give the wrong impression? Have they made a claim that goes further than the evidence allows?
For middle school classes, this can be a short science communication activity. High school students could compare two explanations of the same topic and evaluate which is clearer, more accurate and better supported by evidence.
A useful discussion question is: What makes a scientific explanation engaging without sacrificing accuracy?
For further reading, visit NASA's profile of Carl Sagan.
2. The 1965 Northeast US blackout: when electrical systems fail
On 9 November 1965, a major power blackout affected parts of the northeastern United States and Canada. The event involved a cascading failure in the electrical grid, demonstrating how a fault in an interconnected system can contribute to a much wider disruption.
Electrical grids are not simply collections of independent power stations and wires. They are connected systems in which generation, transmission and demand have to be managed together. When one part of a grid experiences a problem, the effects can spread through other parts of the network. Depending on the circumstances, this can cause further equipment or system failures and interrupt electricity supplies across a large area.
The blackout is a useful historical example because it connects familiar experiences, such as losing power at home, with the engineering challenges involved in supplying electricity to millions of people. It also illustrates why engineers study not only individual components but how those components behave when connected.
Classroom connection: How can a small fault spread through a network?
Ask students to imagine a simplified electrical network with several power stations, transmission lines and towns. What might happen if one transmission line became unavailable? Could the remaining lines carry the extra load? What might happen if another component then failed?
Students can draw a simple network diagram and trace possible consequences when one connection is removed. The model does not need to reproduce the real power grid. Its purpose is to help students think about dependencies and how a local fault can affect a wider system.
For middle school students, the event can introduce electricity, energy supply and the importance of infrastructure. High school students can explore the difference between a component failure and a cascading failure, or investigate how engineers improve the reliability and resilience of interconnected systems.
You could extend the discussion to other systems students use every day, including internet networks, transport systems and water supplies. In each case, ask whether a failure in one part could affect many others.
A useful discussion question is: How can a small fault spread through an interconnected network?
For further reading, see the US Department of Energy's account of the 1965 blackout.
3. Apollo 4: why test a rocket before sending people into space?
On 9 November 1967, Apollo 4 launched on the first uncrewed test flight of the Saturn V rocket. The mission tested the launch vehicle and Apollo spacecraft systems ahead of crewed lunar missions.
Spaceflight requires many systems to work together under demanding conditions. A launch vehicle must produce enough thrust to overcome Earth's gravity and accelerate its payload. The spacecraft and its equipment must also function through launch, flight and the other stages of the mission. Testing these systems before sending astronauts into space helps engineers identify problems, gather performance data and improve their designs.
Apollo 4 is a strong example of why engineering involves more than designing something that should work in theory. A model, calculation or laboratory test can provide useful evidence, but a complex system must also be tested under conditions that represent its intended use. Uncrewed tests can reduce the risks involved in learning how a new vehicle behaves in flight.
The mission also offers a way to discuss the relationship between engineering and scientific evidence. Engineers use established scientific principles, calculations and simulations, but they also need measurements from real systems to evaluate performance.
Classroom connection: Why test a complex system without a crew?
Ask students to think about a new vehicle, medical device or piece of safety equipment.
What could engineers learn from testing it before people depend on it? Which parts could be tested separately, and which would need to be tested as a complete system?
Middle school students can identify the risks involved in launching a rocket and explain why testing different components matters. High school students can consider how engineers use test data to compare predicted performance with actual results, identify unexpected behaviour and decide whether a system is ready for the next stage.
A useful extension is to ask students to design a simple testing plan for a fictional spacecraft. They should identify what needs to be tested, what measurements they would collect, and what results would make them change the design. This brings together physics, engineering design and evidence-based decision-making.
A useful discussion question is: Why test a complex system without a crew before using it for a human mission?
For further reading, visit NASA's Apollo 4 mission page.
Using science history to start a lesson
These three events offer different ways to bring scientific thinking into the classroom. Carl Sagan's work provides a starting point for communicating science clearly. The 1965 blackout illustrates how interconnected systems can fail. Apollo 4 shows why testing and evidence are essential when developing complex technology.
A simple way to use science history is to give students a short introduction to an event and then ask them to respond to one carefully chosen question. Students can write an individual answer, discuss their ideas in pairs or compare their reasoning as a class. Ask them to support their explanations with details from the story rather than relying only on prior knowledge.
You could also use an image related to each event as a question-generation warm-up. Give small groups three to five minutes to produce as many questions as possible. Afterwards, students can sort their questions into those they can answer using existing knowledge, those that require further research, and those that might lead to an investigation.
This approach works across science disciplines and can be adapted to different ages. Younger students might focus on describing what they observe and asking straightforward questions. Older students can investigate causes, evaluate evidence, consider limitations and explore the implications of a scientific or engineering decision.
More science history to explore in November
The next few days of November offer further opportunities to connect science with technology and society.
On 10 November, World Science Day for Peace and Development provides a starting point for discussing the responsibilities scientists have when their work affects society. The launch of Luna 17, carrying the Lunokhod 1 rover, introduces space exploration and robotics, including the challenges of remotely operating a vehicle on another world.
Microsoft's announcement of Windows in 1983 offers a connection to computing history and graphical user interfaces. It is also a useful reminder that an announcement date and a product's release date are not necessarily the same.
As the month continues, teachers can choose stories that complement their current units or use an event to introduce a new topic. A short historical example can make an abstract concept more tangible, while a discussion question encourages students to do more than simply remember a date or name.
Find more Science on This Day classroom resources
If you would like a ready-to-use selection of science history stories for the whole month, my November Science on This Day resource set includes 109 items across the 30 days of November.
The set comes in four formats: an interactive HTML version with filters, editable Google Slides with classroom discussion questions, a filterable spreadsheet, and a straightforward PDF version. You can select individual events to suit your lesson rather than having to use every story, making the collection suitable for lesson starters, short readings, retrieval practice and classroom discussions.
You can also explore the wider Teaching Astrophysicist store for other free and paid science teaching resources.
Science history can be a practical way to connect curriculum content with real events and decisions. A few minutes spent exploring a person, a system failure or an engineering test can help students practise asking questions, explaining evidence and thinking about how science works beyond the classroom.
Thanks for reading
Cheers and stay curious
Oliver - The Teaching Astrophysicist
