For this experiment you’ll need to take two measurements at least 250 km (a little more than 150 miles) due north or south of each other. You will make a couple of observations, take some measurements, use some math, and discover if the surface of the Earth is curved, and, if so, by how much. … More Is the Earth Flat?
Scaling the Solar System Purpose: To understand the sizes and distances of solar system objects by making a scale model of the solar system based on the Sun as an eight-inch bowling ball. Make a couple of Predictions: If an 8” bowling ball represents the size of the Sun, what common object would represent the … More Scaling the Solar System
I am not an expert on Dark Matter or Dark Energy, I barely understand the reasons scientists think they’re out there. At the same time, I do like talking and reading about Dark Matter and Dark Energy. Today I ran into an article titled “The Dark Matter Poltergeist” by Dr. Katie Mack, and questions bubbled … More Questions about Dark Matter
Miss Leavitt’s Stars: The Untold Story of the Woman Who discovered How to Measure the Universe By George Johnson Atlas Books, 2005 One night at the observatory a voice in the dark asked “How do I reconcile the information that the Andromeda Galaxy is 2 million light years away with the growing number … More “Science lies not in the facts themselves but in their arrangement.”
One of my Periscope followers recently asked if I was aware of Earth’s twin planet, you know, the one scientists refuse to acknowledge? Reporters on board a helicopter had photographed it eclipsing Venus, he said. There’s even a YouTube video of the mysterious event. I don’t make a habit of tracing down every story … More Did a Mysterious Earth-Twin Eclipse Venus?
Neptune, the eighth planet from the Sun, is shown here in the middle of this image with the moon Triton just below it and to the left. This is a one second exposure and North is down and to the left. Taken at 8:40 pm on October 30, 2016 with the Prompt 3 telescope in … More The god of the seas and the messenger of the seas visit the water carrier
For much of August, I conducted an informal poll on Periscope. Periscope is a social media that allows me to broadcast live to the world on the internet. I’ve been hosting a conversation called “Let’s Talk Astronomy” on Periscope since last December, and have enjoyed meeting some very interesting people there. During my last 8 … More What’s Your Favorite Planet?
I’m scheduled to host at Cline Observatory tonight, Friday, August 12. Here are my observing plans for the evening.Join us.********************* Near to Far then back******************** Mars (featured object) 0.78 Astronomical Units (AU) distant Since June 29 in pro-grade motion Named for a god of the Germanic people, Freya Saturn at 9.6 AU distant Less dense … More Observing Plans for Friday, August 12, 2016
Sometimes folks use the word “weight” instead of mass, but I know what you mean. Having spent my whole life on Earth, I’ve come to the point of equating the two in casual conversation. So astronomers tend to talk about “mass” as one aspect of a celestial object; planet, moon or star. So what’s the … More What’s the mass of that planet?
Do Suns have Three Lives? Main Sequence, Red Giant, White Dwarf In very broad terms, those are stages our Sun will evolve through as it ages and dies. The end won’t commence for 4 or 5 billion years, so we don’t need to panic. (In Part 1, I described how we have been … More Our Changing Sun (conclusion)