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he is hot. ya and he is hilarious. it's hard but read your book and it's all good. cheat sheets kick ass.

the f-ing ****. demos are great but you will not get an A probibly a B+/A-

Good teacher. Lots of interesting demos to keep you awake. Lets you have a cheat sheet with notes for midterms and final, which is a huge help.

I'll give him a chili because he was awfully upset when he found out no one gave him a chili here.

Great professor. Had lots of demos which made class fun. Sometimes I felt he needed more examples and less off-topic discussions. Exams were fair considering we were allowed cheat sheets, a calculator and he curves. He was very personable. Ton's of homework. Keep up with the homework because they are worth as much as an exam.

wonderful professor...he uses lots of demos to explain concepts, his exams of fair, and he's personable. I started his class hating physics, and I'm now considering a physics major.

Very entertaining! Likes to connect physics to life sciences. His tests are hard though.

Fair class, we were given cheat sheets and calculators for tests. Can have somewhat hard test but gives u a syllabus of whats going to be on it. Fun demos, good personality and funny. The only downside is that too many fun demos less teaching. Needs to teach the material more and not go off on astronomy tangents. Over good prof. with a curve.

Makes lectures fun with demos, but doesnt always teach enough. You have to do all the reading and homework to learn. Nice and funny guy. The 1st midterm was really hard, but they get easier if you know what youre doing.

Though the class and exams may seem tough, the curve makes everything ok. As long as you're somewhat prepared and have all the formulas on the sheet for the exams, you should be just fine! He makes class fun with his demonstrations and weird reactions to them!

This guy is awesome. He's great at explaining everything, and does cool demos in lecture. And the tests are extremely easy, i dont know why everyone complains.

kinda hard but funny and wants to help

Fun and nice. Very helpful. Great demonstrations end engaging lectures.

I adored Geller's Astro 1 class. You can tell he loves teaching it. The class was thought-provoking and made me appreciate life more. If understanding the universe, stars, planets, and other celestial phenomena sounds boring to you don't take the class. His physics courses artificially lower his rating. Don't let that deter you from taking Astro 1!

Geller is so funny and his lectures are so interesting yet easy to understand. Homework is pretty simple. Lectures and hw correlate directly to exams so they're pretty easy. Since he wrote the textbook, his lectures basically follow the textbook so if you miss one it's not a big deal. Loved Geller and this class!

DONT TAKE HIS ASTRO 1!! RUN!!!

He does a good job explaining concepts and makes us laugh during lectures. The homework can look heavy, but it's all easy stuff that takes an hour max. The weekly essays can be daunting but it's seriously not bad at all and in the long run helps you understand things better for the tests. Overall an enjoyable time even though the midterm was rough.

His lectures are all conceptual and have nothing to do with calculations. After asking friends, I heard a majority of his questions are mathematical-based. In addition to his teaching, he also does not post any resources. His notes are from a student, not himself. And he does not provide any videos of himself explaining those mathematical problems.

Be ready to pay 60 USD to access the textbook and hw for a quarter. There are 3 online HW due dates per week and a mandatory in-class essay administered during sections each week. The exams are entirely MCQs so it is very easy to get thrown to B-. Lectures are fine but don't provide sufficient insight. Just take someone else's class...

Great professors, but the exams you need to take are harder than the assignments and harder to get a grade for.

This has been one of my favorite classes due to both material and professor. Geller is great and I loved the lectures. Tests were kind of hard, but weren't weighted very heavily (final = 20%). There is kind of a lot of homework, but it was generally pretty easy and didn't take long. Doing/understanding homework is necessary for good grade.

Only chance to ask questions is in lecture. He is responsive and helpful, but you're expected to rely on TAs for info outside of class. Lots of homework and reading per week. Lots of studying is recommended, you cannot just do the bare minimum in this class. Grading is dominated by your homework and quizzes but includes long midterms and finals.

In terms of difficulty, his class was not free, but I think if you put in the effort, you can get a decent grade. For his lectures, I attended every single one because they were so fun. He is clearly very passionate about what he teaches, and that passion is very contagious. I would suggest you do a quick review before the discussion sections.