opinion: Per Curiam.
  The petition for habeas corpus in this case, which was filed in the District Court for the Northern District of California and which was prepared by petitioner pro se, attacked the constitutionality of petitioner’s confinement in the state prison system pursuant to the California Indeterminate Sentence Law. Petitioner recited that he was convicted in 1952 on two counts of first-degree robbery and was given consecutive sentences of not less than five years each, with no maximum prescribed by law. California law provides that where no maximum term is set, the punishment shall be life imprisonment subject to the power of the California Adult Authority to “determine and redetermine” the length of time that a prisoner shall be required to serve. Cal. Penal Code §§ 671 (1955), 1168, 3020 (1956).
  Petitioner asserted that in June 1961 he appeared before the Adult Authority for parole consideration, as he had done on a yearly basis during his confinement. According to petitioner, during that appearance the members of the Authority evinced an intention to extend his term beyond March 1962, the date that had been tentatively set for his discharge, solely because petitioner refused to admit his guilt. Shortly after the appearance, the Adult Authority rescinded its earlier action scheduling petitioner for release in 1962; no new date for release was fixed, and petitioner has remained in custody continuously since that time.
  The petition for habeas corpus stated flatly that the appearance before the Authority in June 1961 was for routine parole consideration; petitioner claimed that he had been free from infractions of prison rules for at least a year prior to the appearance. He further declared that he was given no reason for the redetermination of his sentence, and received no notice or hearing concerning any possible basis for such action. In conclusion, petitioner stated that, “obviously, the only reason for this action was to coerce petitioner to plead guilty and not challenge his conviction after being released on discharge.”
  Respondents filed no response to the petition in the District Court. That court denied the writ without a hearing, in a brief order stating that no federal questions had been presented. The Court of Appeals for the Ninth Circuit denied a certificate of probable cause to appeal for the reasons expressed by the District Court, and petitioner applied to this Court for a writ of certiorari. On the facts recited by petitioner, we granted certiorari to consider his contention that his privilege against compulsory self-incrimination had been infringed by the prison authorities. 393 U. S. 1062 (1969).
  In its brief on the merits, respondents have brought to our attention a series of prison documents, whose accuracy has in no way been drawn into question by petitioner, that cast petitioner’s detention in a light wholly different from that shed by his petition for certiorari. These documents show that in December 1960 Conway was served with a notice charging him with violation of prison rules and informing him that the violation might result in a refixing of his prison term; he attended a hearing at which he was found guilty of fighting with another prisoner and was sentenced to three days in isolation, with a recommendation that his Adult Authority appearance be postponed until June 1961. Following that appearance, as petitioner notes, the Authority rescinded its earlier action fixing a determinate sentence, thereby reinstating by operation of law his initial indeterminate sentence. Thus, it now appears respondents have documentary evidence that the actual facts simply do not present the issue for which certiorari was granted by us.
  That this imposition on this Court has been revealed only at this late stage seems to have been the result of the policy of the Attorney General of California, as explained in the respondents' brief, to make no response to habeas corpus petitions of state prisoners unless the court in which a petition is filed requests a response, as for example, so respondents say, by issuing an order to show cause why the writ should not be granted. Since no response eventuated in this instance and respondents also failed to flush the problem at the certiorari stage, both this Court and the attorney appointed by the Court to represent petitioner here have unwittingly been placed in the unfortunate posture of addressing a situation that does not exist.
  In this state of affairs we decline to adjudicate this case. Were we to pass upon the purely artificial and hypothetical issue tendered by the petition for certiorari we would not only in effect be rendering an advisory opinion but also lending ourselves to an unjustifiable intrusion upon the time of this Court. Accordingly, the writ of certiorari is dismissed as improvidently granted.
  It is so ordered.
  See Cal. Penal Code § 1168 (1956) and provisions there listed.
  Petitioner claimed that his discussion with the members of the Authority had turned to what he planned to do if released. When petitioner stated that he expected to go “to Bakersfield,” one member responded: “But that is where you got into this trouble. What are you planning to do there?” Petitioner declared, “I’m going to fight my case,” prompting the member to ask whether petitioner had not admitted to the Authority, two years earlier, that he was guilty. After petitioner denied the previous admission, the members raised — assertedly for the first time — the possibility of extending petitioner’s term.
  In response to the petition for certiorari respondents merely locked horns with the allegations of the petition as filed, without drawing the Court’s attention to the actual facts as subsequently revealed in its brief on the merits.
choices: comity: civil rights comity: criminal procedure comity: First Amendment comity: habeas corpus comity: military comity: obscenity comity: privacy comity: miscellaneous comity primarily removal cases, civil procedure (cf. comity, criminal and First Amendment); deference to foreign judicial tribunals assessment of costs or damages: as part of a court order Federal Rules of Civil Procedure including Supreme Court Rules, application of the Federal Rules of Evidence, Federal Rules of Appellate Procedure in civil litigation, Circuit Court Rules, and state rules and admiralty rules judicial review of administrative agency's or administrative official's actions and procedures mootness (cf. standing to sue: live dispute) venue no merits: writ improvidently granted no merits: dismissed or affirmed for want of a substantial or properly presented federal question, or a nonsuit no merits: dismissed or affirmed for want of jurisdiction (cf. judicial administration: Supreme Court jurisdiction or authority on appeal from federal district courts or courts of appeals) no merits: adequate non-federal grounds for decision no merits: remand to determine basis of state or federal court decision (cf. judicial administration: state law) no merits: miscellaneous standing to sue: adversary parties standing to sue: direct injury standing to sue: legal injury standing to sue: personal injury standing to sue: justiciable question standing to sue: live dispute standing to sue: parens patriae standing standing to sue: statutory standing standing to sue: private or implied cause of action standing to sue: taxpayer's suit standing to sue: miscellaneous judicial administration: jurisdiction or authority of federal district courts or territorial courts judicial administration: jurisdiction or authority of federal courts of appeals judicial administration: Supreme Court jurisdiction or authority on appeal or writ of error, from federal district courts or courts of appeals (cf. 753) judicial administration: Supreme Court jurisdiction or authority on appeal or writ of error, from highest state court judicial administration: jurisdiction or authority of the Court of Claims judicial administration: Supreme Court's original jurisdiction judicial administration: review of non-final order judicial administration: change in state law (cf. no merits: remand to determine basis of state court decision) judicial administration: federal question (cf. no merits: dismissed for want of a substantial or properly presented federal question) judicial administration: ancillary or pendent jurisdiction judicial administration: extraordinary relief (e.g., mandamus, injunction) judicial administration: certification (cf. objection to reason for denial of certiorari or appeal) judicial administration: resolution of circuit conflict, or conflict between or among other courts judicial administration: objection to reason for denial of certiorari or appeal judicial administration: collateral estoppel or res judicata judicial administration: interpleader judicial administration: untimely filing judicial administration: Act of State doctrine judicial administration: miscellaneous Supreme Court's certiorari, writ of error, or appeals jurisdiction miscellaneous judicial power, especially diversity jurisdiction