How Can Rocket Exhaust Make a Hole in the Ionosphere?

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Rocket exhaust can make a temporary “hole” in the ionosphere by changing its chemistry. Molecules released high above Earth help positive ions recombine with free electrons, reducing the number of charged particles in a region. The word hole describes that local depletion. Air remains present, and the atmosphere has not been ripped open like fabric. Understanding the effect starts with a less visible feature of our planet: some of its upper atmosphere carries an electrical charge. Sunlight supplies much of that charge. Energetic ultraviolet radiation and X-rays can knock electrons away from atoms and molecules, leaving positive ions alongside free electrons. NOAA’s ionosphere overview places this region roughly 50 to 370 miles above Earth. Its electrical properties change with sunlight, location and solar activity. It also contains several layers with different particle densities. A rocket therefore passes through a changing environment rather than a rigid shell with a fixed thickness...

How Does Alaska’s Ranked-Choice Vote Count Work?

Conceptual illustration of a ranked ballot and colored counters arranged in groups beside an Alaska silhouette

Alaska’s ranked-choice count treats a ballot as one vote for its highest-ranked candidate still in the contest. First choices are counted first. If a candidate has more than half the active ballots in that opening count, the candidate wins. Otherwise, the lowest-polling candidate is eliminated and affected ballots move to their next available choices. The rankings let a voter express a backup preference without returning to cast another ballot.

The general-election count belongs to a system voters approved in 2020. For the congressional and state offices covered by Alaska’s top-four primary, voters first pick one candidate from a shared primary ballot. The four leading candidates can advance regardless of party. The general election then lets voters rank the finalists. As the Alaska Legislature’s citizen guide explains, selecting the field and choosing the eventual officeholder are different stages. A primary finish supplies a place on the next ballot, rather than a share of votes carried into November.

A ranked ballot does not divide someone’s vote among several candidates at once. Suppose you put Avery first, Blair second, and Casey third. Your ballot initially counts for Avery. It stays there while Avery remains in the count. Blair receives that vote only if Avery is eliminated and Blair is still competing. Listing Blair second therefore does not subtract anything from Avery’s opening total. Alaska’s official election pamphlet explains this distinction between a first preference and a conditional later choice.

Imagine a completely hypothetical election with 100 active ballots and three candidates. Avery starts with 40 votes, Blair with 35, and Casey with 25. Avery leads but has no majority, so Casey is eliminated. If 20 of Casey’s voters ranked Blair next and five ranked Avery next, Blair finishes with 55 and Avery with 45. Nobody filled out a new ballot. The result changed because preferences already written on the original ballots became relevant after one candidate left the contest.

Now change one detail in that example. Suppose 15 of Casey’s ballots transfer to Blair, five transfer to Avery, and five contain no ranking for either remaining candidate. The final count becomes Blair 50 and Avery 45, with five ballots inactive. Blair has 50 of the 95 active ballots, which is more than half, even though 50 is only half of the original 100. This arithmetic is why the denominator matters when someone describes a ranked-choice winner’s percentage.

Alaska calls a ballot inactive when it no longer supplies a usable preference for the continuing count. The Division of Elections identifies several reasons, including having no remaining ranked candidate, assigning the same continuing ranking to multiple candidates, or leaving two consecutive rankings empty before the next usable preference. An inactive ballot is not evidence that its earlier vote was erased. In the example, those five ballots counted for Casey before Casey was eliminated; they simply supplied no choice between Avery and Blair.

Alaska’s published tabulation guidance also includes a detail that short summaries can miss. Unless someone wins a majority in the first round, the state continues the elimination process until two candidates remain. With a larger field, there can therefore be several transfers before the final comparison. It helps to read the state’s round-by-round totals as successive snapshots of the same set of preferences. Adding every round’s totals together would count the same ballots repeatedly and produce a meaningless number.

Ranking additional candidates is optional. The state’s sample-ballot guidance says a voter does not have to rank the entire field, and a second choice counts only after the first choice is eliminated. That choice determines how much information the ballot supplies if the field narrows. To understand any particular result, look for the first-round totals, the eliminated candidates, the transfers, and the active-ballot total in the final round. Together they show how a set of individual preference orders becomes one decision about who takes the seat.

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