young stellar object

A protostar in which the dust and gas have collapsed into a sufficiently massive body for fusion to begin. The characteristic trait of young stellar objects is the presence of jet outflows-either of molecular gas or of radioactive emissions-that interact with the interstellar medium out of which the star has just been born. See more at protostar.

Nearby words

  1. young man,
  2. young offender institution,
  3. young one,
  4. young plan,
  5. young pretender,
  6. young thing,
  7. young turk,
  8. young turks,
  9. young's modulus,
  10. young's rule

The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.