They "land" on other stars still existing and also on planets at their earlier stage.
So all this means that "before" there were no other elements besides hydrogen and helium. But "after", the heavier elements became part of the universe. We are part of the universe too. Therefore, it is logical to conclude that every matter, including us humans, animals, and all the other forms of life that exist on the Earth, and who knows, on other worlds too, consists of elements that originated from stars that as you said "blew up".
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Brian say: Yes, iron and every other part of your body comes from a star that blew up a long long time ago. This goes back to the question of how did humans, earth, the sun come to be. Once a galaxy is formed it normally creates a ton of sun's close to the center, those suns exist for a long time and then eventually go super nova. When some suns die they explode, the explosion sets the stage for a new sun to be created.. This also causes heavier elements to be created. As such if you repeat the process a few times from the Milky way you will eventually come to the creation of our own sun. Which would have been created by a different sun having died and exploded long ago. The sun and the planets are thus created from the nebula that was a star in the distant past. From there the earth is created after which all the elements are created. You can argue the origin of life, if it is from a alien planting it on earth or a random meteor crashing into earth, or a alien like god saying there be man. However since we are born we take in the elements in our surrounding as building blocks. Since it comes from earth and the earth comes from a nebula and the nebula comes from a exploding star...
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Quadrillian say: What if it did?
It is the same iron that has been recycled countless times through the biosphere. Before it got into your blood it was in the sap of trees, the blood of rats, the turds of babboons, and the urine of dinosaurs?