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if this is for a school presentation, imagine how bored your audience is gonna be...so pick a topic about astronomy that is controversial and liable to get the audience to ask question,thus taking up some of the valuable time...i did the same thing for a university talk,got all the docs and profs in a twizz about an observation i'd made and made the claim it obviously must be proof the theories are wrong..lol ate up loads of my 30 minute talk time as they argued between themselves....and they thought they were the cleverest in the room..so i suggest a topic about the ethical consequences of man finding life on other planets and how this relates too the bible and religion as a whole.

do some research or ask on the religious forums on here for material, you'll get lots of good talking points plus you'll sound 'dead' clever...good luck

When I was in High School I gave a speech titled "True Christians Do Not Celebrate Christmas" The title alone got everyone's attention and stimulated a discussion afterwards. Those facts alone would have gotten a good grade even if the material was sketchy. The internet is jammed full of info about the pagan origin of the modern day Christmas celebration, how it was celebrated prior to Jesus' birth, and how it got adopted into the Catholic church in the 3rd century. You could also do something on global warming but I think it's overdone right now and may get a so-so grade. It sounds like you wait until the last minute to complete your assignments. What happens when you find a subject you love? You probably won't do it justice. Good luck.

The formation of Saturn's rings and how they continue to change.

Solar flares.

Near-Earth asteroid mining (several companies are looking at doing this, some as soon as the 2020's).

The Large Impact Theory of the formation of our moon.

Extrasolar planets and how they are discovered/detected.

There's 5 ideas.

Stars

I would've preferred topic like "the death of our Sun & its effects on Earth & other planets through its journey towards death in different phases".

Many things in this topic can be mentioned like:

1. How our Sun would end & how much time will it take

2. Different Phases involved in journey of Sun towards death

3. Effects on Earth (as planet) in each phase

4. Effects on Earth's life in each phase

5. Effects on Mercury, as closest planet

6. Effects on Mars, as farthest rocky planet

7. Effects on gas giants & ice giants in our solar system

8. Sun after death, white dwarf or black dwarf

9. Effects on Orion Arm of Milky Way

10. Chances of human race survival. Would we be able to find new home till the Sun dies & force human civilization on Earth to cease

And many more...

Uranus

life of a star, from birth in a nebula to death as a dwarf or a black hole