So taking observations, forming a hypothesis based off of them, and then testing that hypothesis with more observations is not science?
ABSOLUTELY NOT.
You guys don't know the first thing about "real" science. I don't know what substandard schools you attended, because the Scientific Method is required in all sciences. Astronomy is not a science. Here's another image displaying the steps of the Scientific Method:

See that? Astronomy fails right where the "test with an experiment" part comes in. Newton never did any experiments to prove his hypothesis of gravity as a force. Copernicus never did any experimentation to prove his hypothesis of the earth is revolving around the sun. No experimentation is ever attempted. The need for it is denied entirely.
The steps in Astronomy are just Observe -> Interpret, just like any religion or pseudoscience.
It's all well and good calling things like dark energy made up, but unless you can propose a better hypothesis to take it's place, I see little reason to dismiss it.
You don't see a reason to dismiss a made up hypothesis without evidence what-so-ever to back it up? When science remains at the hypothesis stage, it is not a science. Science requires, you know, actual "experiments" to be conducted to come to the truth of the matter.
If you are content with hypothesis, you may as well join some cult.
You could say something similar for any kind of scientific experiment.
No. Other sciences are conducted fundamentally different to Astronomy.
For example, it's believed that water is a molecule made from H20. Two hydrogens and one oxygen. To test this we can use the electrolysis of water to come to the absolute truth of the matter. Electricity separates the elements into sealed of flasks. One element comes out twice as much as the other.
If there is any question such as "maybe it's not really oxygen", the hypothesis can be put to the test (important!) by conducting an experiment like lighting it on fire, mixing it with another element, or airing into a sealed container with an insect. The experimenter can try all sorts of different things to come to the truth of the matter. If there's another question it can always be put to the test to see if the hypothesis has merit. Whatever the question might be, it can be put to the test. Each and every variable can be controlled and modified for whatever the experiment is testing. In the end, after many successive hypothesis' and experimental trials, the experimenter can come to the concrete conclusion that the oxygen in water is the same oxygen known elsewhere.
Astronomy cannot come to conclusions of any sort. Nothing can be put to the test. It cannot be studied in such a manner. It exists as one hypothesis built on another, rambled off in mumbling pretension.
You can't tell exactly what is happening, you can only observe it's effects. This doesn't make it stop being science.
Yes, actually it does. If you only observe and hypothesize, it is not a science. Observation and hypothesis is what religions do.
What astronomy does is not "science". It doesn't even pretend to be. Astronomers are not "scientists".