Because the Space Force just isn't ready. Yet.
On Apr. 15, 2018, an asteroid similar in size to one that may have caused the 1908 Tunguska Event in remote Siberia flew by Earth by a mere 119,400 miles, just half the distance between the Earth and the Moon — and we didn't even know it was coming.
If you're unfamiliar with the Tunguska Explosion, it was a mysterious explosion in the most remote region of Russian Siberia that flattened 2,000 square kilometers of forest. It was the largest explosion in Earth's recorded history and was one-third the size of the Tsar Bomba, the Soviet Union's largest nuclear detonation — enough to flatten a large metropolitan area.
This is all anyone saw of the near-miss asteroid. One amateur Austrian astronomer's gif.(Michael Jäger)
And we only knew about it one day before it flew by.
Like something from a 1990s-era disaster movie, President Trump wants to tackle the problem and make the United States the leader in asteroid impact avoidance. Politico reports that Trump wants to spend $100 million toward that effort, which includes unmanned spacecraft that would nudge a small asteroid off course.
NASA estimates there are 1,000 such asteroids close to Earth, what they refer to as "near-Earth objects." The bad news is that they also estimate there are upwards of 10,000 near-Earth objects that they don't know about. A growing number of those are said to be the size (or larger) than the ones that wiped out the dinosaurs 65 million years ago.
Not this President.
The office getting the budget bump is NASA's planetary defense office, who created a new asteroid-mitigations strategy with the White House and FEMA just last year. None of the proposed strategies involved oil drillers or astronauts; NASA actually scoffs at that idea, saying the work could be done entirely by robotic spacecraft.
But the recent near-miss wasn't an event that required NASA's intervention. The asteroid 2018 GE3 flew harmlessly between the Earth and Moon's orbits, continuing its regular orbit.
"If 2018 GE3 had hit Earth, it would have caused regional, not global, damage, and might have disintegrated in the atmosphere before reaching the ground," SpaceWeather.com reported. "Nevertheless, it is a significant asteroid, illustrating how even large space rocks can still take us by surprise. 2018 GE3 was found less than a day before its closest approach."
NASA's California-based Jet Propulsion Laboratory made a model of the orbits of asteroid 2018 GE3, Earth, and other planets in the Solar System, so we can all track where the asteroid is at any given time. Below is the position of the asteroid in relation to Mercury, Venus, Earth, Mars, and Jupiter at the time of this week.
NASA's next test will use robot spacecraft to ram an orbiting moon around the asteroid Didymos, currently seven million miles away from Earth, in an effort to change the satellite's orbit. The only thing delaying this test that everyone agrees is a good idea and that we should definitely get started on is Congress, who are waffling on the latest spending bill that would keep this program along with the U.S. government, running.
It could take as long as another three months to pass the appropriations for the program while NASA estimates a delay of six months or more could affect the program entirely, leaving Earth defenseless.
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