You can copy and paste text into
lexile.com to find out the lexile level of the text.
I located NewsELA articles about the rocket that landed on a comet and about a rover that had explored Mars. I gave kids choices about what they read as long as it was in their lexile reading range. I would should them the two articles copied at their level and ask that they choose one.
Some students could choose between the sun or moon in books that I found in my school's book room.