The threat of city-destroying asteroids is a real and terrifying prospect, and it's no wonder that NASA scientists are losing sleep over it. With tens of thousands of these potential killers lurking in our cosmic neighborhood, the question arises: Are we prepared to defend ourselves?
NASA's planetary defense officer, Kelly Fast, revealed that there are approximately 25,000 asteroids near Earth, each measuring over 140 meters in diameter, and we only know the whereabouts of about 40% of them. This lack of knowledge is a cause for concern, as these asteroids could cause catastrophic damage if they were to collide with our planet.
Fast's job is a critical one: to find these asteroids before they find us. She and her team are working tirelessly to develop methods to detect and, if necessary, deflect these celestial bodies. The Near-Earth Object Surveyor space telescope, set to launch soon, will aid in this mission by using thermal signatures to identify dark asteroids and comets that have previously evaded detection.
But here's where it gets controversial: while NASA has successfully tested a spacecraft, DART (Double Asteroid Redirection Test), by crashing it into a mini-moon at an incredible 14,000 mph, proving that we can alter an asteroid's path, the technology is not yet readily available. Nancy Chabot, a planetary scientist who led the DART mission, expressed her concern, stating that it "keeps me up at night" knowing we don't have another DART-like spacecraft ready to launch if an asteroid were detected on a collision course with Earth tomorrow.
Last year, an asteroid named YR4, measuring up to 90 meters wide, caused widespread alarm when it was initially believed to have a 3.2% chance of colliding with Earth in 2032. Thankfully, further investigation by NASA downgraded that risk to zero, but the incident highlights the need for better preparedness.
The James Webb Space Telescope will be tracking YR4 this week, as there is still a 4% chance it could collide with the Moon. Such an event would create a bright flash visible from Earth, a stark reminder of the power and unpredictability of these celestial bodies.
Chabot believes that NASA has the technology to develop craft capable of protecting our planet, stating, "We could be prepared for this threat. We could be in very good shape." But the question remains: Are we taking the necessary steps to ensure our safety?
And this is the part most people miss: while large asteroids, sometimes referred to as "planet killers," are easier to track due to their size, it's the smaller, harder-to-detect ones that could cause regional damage. Fast emphasizes that it's these "in-between" asteroids that pose the greatest threat, as they are more elusive and could potentially slip through our defenses.
So, are we doing enough to protect ourselves from these cosmic threats? The debate is open, and we invite you to share your thoughts in the comments. Could we be doing more to ensure the survival of our planet and its inhabitants?
