מחקר חדש שהתפרסם ב-21 לפברואר, ופורסם ב-Nature Communications, חושף שלכדור הארץ, בדומה לביצת הפתעה של "קינדר", יש מסה קשה במרכזו

צוות מגזין אפוק | 22 בפברואר 2023 | חדשות | 1 דק׳

מדענים גילו שכבה חמישית בליבת כדור הארץ

מחקר חדש שהתפרסם ב-21 לפברואר, ופורסם ב-Nature Communications, חושף שלכדור הארץ, בדומה לביצת הפתעה של "קינדר", יש מסה קשה במרכזו. מתחת לקרום הידוע של כדור הארץ, המעטפת המותכת והליבה החיצונית והפנימית, מצאו מדענים שכבה חמישית מפתיעה המורכבת מכדור מתכתי מוצק.

המחקר בוצע על ידי ניתוח גלים סיסמיים (גלי אנרגיה העוברים באדמה) הנעים למרכז כדור הארץ. המחקר עקב אחר רעידת אדמה שהתרחשה באלסקה והפעילה גלים סיסמיים בדרום האוקיינוס האטלנטי לפני שהם חזרו למוקד הרעידה. באמצעות מידע זה, המדענים בחנו את מהירות ומסלול הגלים ומצאו עדויות למסת מתכת קשה העשויה מסגסוגת ברזל ניקל.

התגלית שפורסמה במחקר עשויה להצביע על כך שאירוע עולמי גדול התרחש במהלך ההתפתחות של כדור הארץ שגרם לשינוי משמעותי במרקם של ליבת כוכב הלכת.

רוצה לקרוא עוד?

להמשך קריאה הירשמו או התחברו

אילוסטרציה תלת מימדית של מבנה ליבת כדור הארץ, על פי מה שידוע למדע עד היום | קרדיט: shutterstock.com

אילוסטרציה תלת מימדית של מבנה ליבת כדור הארץ, על פי מה שידוע למדע עד היום | קרדיט: shutterstock.com

כריס רייט

מזכיר האנרגיה של ארה"ב: נחתום על הסכם עקרוני עם סעודיה בתחום האנרגיה הגרעינית

צוות מגזין אפוק

העיר סומי לאחר המתקפה

מעל 20 הרוגים במתקפת טילים בליסטיים רוסית על אוקראינה

דורון פסקין

נשיא מצרים ואמיר קטאר מקיימים היום פסגה בדוחא; במוקד – הפסקת אש ברצועת עזה

דורון פסקין

"החלו לדבר": איראן דיווחה על אווירה חיובית, אך מה היא באמת רוצה?

צוות מגזין אפוק

צה"ל השלים את כיתור רפיח; שר הביטחון לתושבי הרצועה: זה הזמן לקום ולסלק את החמאס

קרן זריהן

דובר משרד החוץ האיראני: החלו השיחות בין ארה"ב לאיראן

צוות מגזין אפוק

הירשמו לניוזלטר שלנו וקבלו תוכן חדש למייל מדי חודש

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